_localStream = await LocalStream.getUserMedia(
              constraints: Constraints.defaults
                ..simulcast = false
                ..resolution = resolution
                ..codec = codec);

_localStream = await LocalStream.getUserMedia(
              constraints: Constraints(
            audio: true,
            video: false,
            codec: codec,
          ));

I/flutter (13346): [ion-sdk-flutter] ERROR: onnegotiationneeded: e => Bad state: No element

track.kind=='audio' 

track.kind=='video'

I/org.webrtc.Logging(20179): EglRenderer: Duration: 4009 ms. Frames received: 0. Dropped: 0. Rendered: 0. Render fps: .0. Average render time: NA. Average swapBuffer time: NA.
D/FlutterWebRTCPlugin(20179): onConnectionChangeCONNECTED
I/org.webrtc.Logging(20179): NetworkMonitorAutoDetect: capabilities changed: [ Transports: WIFI Capabilities: INTERNET&NOT_RESTRICTED&TRUSTED&NOT_VPN&VALIDATED&NOT_ROAMING&FOREGROUND&NOT_CONGESTED&NOT_SUSPENDED LinkUpBandwidth>=49500Kbps LinkDnBandwidth>=49500Kbps SignalStrength: -61 AdministratorUids: [] RequestorUid: -1 RequestorPackageName: null]
I/org.webrtc.Logging(20179): EglRenderer: Duration: 4009 ms. Frames received: 0. Dropped: 0. Rendered: 0. Render fps: .0. Average render time: NA. Average swapBuffer time: NA.

I/flutter (13346): [ion-sdk-flutter] ERROR: onnegotiationneeded: e => Bad state: No element

Analyzing dependencies

Inspecting targets to integrate
  Using `ARCHS` setting to build architectures of target `Pods-Runner`: (``)

Fetching external sources
-> Fetching podspec for `Flutter` from `Flutter`
-> Fetching podspec for `flutter_webrtc` from `.symlinks/plugins/flutter_webrtc/ios`
-> Fetching podspec for `shared_preferences` from `.symlinks/plugins/shared_preferences/ios`
-> Fetching podspec for `shared_preferences_macos` from `.symlinks/plugins/shared_preferences_macos/ios`
-> Fetching podspec for `shared_preferences_web` from `.symlinks/plugins/shared_preferences_web/ios`

Resolving dependencies of `Podfile`
  CDN: trunk Relative path: CocoaPods-version.yml exists! Returning local because checking is only perfomed in repo update
[!] CocoaPods could not find compatible versions for pod "flutter_webrtc":
  In Podfile:
    flutter_webrtc (from `.symlinks/plugins/flutter_webrtc/ios`)

Specs satisfying the `flutter_webrtc (from `.symlinks/plugins/flutter_webrtc/ios`)` dependency were found, but they
required a higher minimum deployment target.

/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:328:in
`raise_error_unless_state'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:310:in `block in
unwind_for_conflict'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:308:in `tap'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:308:in
`unwind_for_conflict'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:684:in
`attempt_to_activate'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:254:in
`process_topmost_state'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolution.rb:182:in `resolve'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/molinillo-0.6.6/lib/molinillo/resolver.rb:43:in `resolve'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/resolver.rb:94:in `resolve'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer/analyzer.rb:1065:in

`block in resolve_dependencies'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/user_interface.rb:64:in `section'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer/analyzer.rb:1063:in
`resolve_dependencies'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer/analyzer.rb:124:in
`analyze'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer.rb:410:in `analyze'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer.rb:235:in `block in
resolve_dependencies'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/user_interface.rb:64:in `section'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer.rb:234:in
`resolve_dependencies'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/installer.rb:156:in `install!'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command/install.rb:52:in `run'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/lib/cocoapods/command.rb:52:in `run'
/Users/mac/.rvm/rubies/ruby-2.6.3/lib/ruby/gems/2.6.0/gems/cocoapods-1.9.3/bin/pod:55:in `<top (required)>'
/Users/mac/.rvm/rubies/ruby-2.6.3/bin/pod:23:in `load'
/Users/mac/.rvm/rubies/ruby-2.6.3/bin/pod:23:in `<main>'
/Users/mac/.rvm/gems/ruby-2.6.3/bin/ruby_executable_hooks:24:in `eval'
/Users/mac/.rvm/gems/ruby-2.6.3/bin/ruby_executable_hooks:24:in `<main>'

"Error: Unexpected null value.
   at Object.throw_ [as throw] (http://localhost:44309/dart_sdk.js:5061:11)
   at Object.nullCheck (http://localhost:44309/dart_sdk.js:5388:30)
   at rtc_video_renderer_impl.RTCVideoRendererWeb.new.findHtmlView (http://localhost:44309/packages/flutter_webrtc/src/rtc_video_renderer.dart.lib.js:752:24)
   at rtc_video_renderer_impl.RTCVideoRendererWeb.new.set srcObject [as srcObject] (http://localhost:44309/packages/flutter_webrtc/src/rtc_video_renderer.dart.lib.js:729:19)
   at rtc_video_renderer.RTCVideoRenderer.new.set srcObject [as srcObject] (http://localhost:44309/packages/flutter_webrtc/src/rtc_video_renderer.dart.lib.js:368:40)
   at ion$.Participant._internal.setupSrcObject (http://localhost:44309/packages/flutter_ion_conference/screens/chat_screen.dart.lib.js:1121:44)
   at setupSrcObject.next (<anonymous>)
   at http://localhost:44309/dart_sdk.js:38640:33
   at _RootZone.runUnary (http://localhost:44309/dart_sdk.js:38511:59)
   at _FutureListener.thenAwait.handleValue (http://localhost:44309/dart_sdk.js:33713:29)
   at handleValueCallback (http://localhost:44309/dart_sdk.js:34265:49)
   at Function._propagateToListeners (http://localhost:44309/dart_sdk.js:34303:17)
   at _Future.new.[_completeWithValue] (http://localhost:44309/dart_sdk.js:34151:23)
   at async._AsyncCallbackEntry.new.callback (http://localhost:44309/dart_sdk.js:34172:35)
   at Object._microtaskLoop (http://localhost:44309/dart_sdk.js:38778:13)
   at _startMicrotaskLoop (http://localhost:44309/dart_sdk.js:38784:13)
   at http://localhost:44309/dart_sdk.js:34519:9"

Analyzing dependencies

Inspecting targets to integrate
  Using `ARCHS` setting to build architectures of target `Pods-Runner`: (``)

Fetching external sources
-> Fetching podspec for `FlutterMacOS` from `Flutter/ephemeral/.symlinks/flutter/darwin-x64`
-> Fetching podspec for `flutter_webrtc` from `Flutter/ephemeral/.symlinks/plugins/flutter_webrtc/macos`
-> Fetching podspec for `shared_preferences` from `Flutter/ephemeral/.symlinks/plugins/shared_preferences/macos`
-> Fetching podspec for `shared_preferences_macos` from `Flutter/ephemeral/.symlinks/plugins/shared_preferences_macos/macos`

Resolving dependencies of `Podfile`
  CDN: trunk Relative path: CocoaPods-version.yml exists! Returning local because checking is only perfomed in repo update

Comparing resolved specification to the sandbox manifest
  A FlutterMacOS
  A flutter_webrtc
  A shared_preferences
  A shared_preferences_macos

Downloading dependencies

-> Installing FlutterMacOS (1.0.0)

-> Installing flutter_webrtc (0.2.2)

-> Installing shared_preferences (0.0.1)

-> Installing shared_preferences_macos (0.0.1)
  - Running pre install hooks

Generating Pods project
  CDN: trunk Relative path: CocoaPods-version.yml exists! Returning local because checking is only perfomed in repo update

――― MARKDOWN TEMPLATE ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

### Command

```
/Users/lvzx/.rvm/rubies/ruby-2.0.0-p598/bin/pod install --verbose
```

### Report

* What did you do?

* What did you expect to happen?

* What happened instead?


### Stack

```
   CocoaPods : 1.8.4
        Ruby : ruby 2.0.0p598 (2014-11-13 revision 48408) [x86_64-darwin14.0.0]
    RubyGems : 2.4.7
        Host : Mac OS X 10.14.5 (18F132)
       Xcode : 11.3 (11C29)
         Git : git version 2.21.0
Ruby lib dir : /Users/lvzx/.rvm/rubies/ruby-2.0.0-p598/lib
Repositories : master-1 - git - https://github.com/CocoaPods/Specs.git @ 22d361b5e8e5029a14bae04b1258a083ae494885
               trunk - CDN - https://cdn.cocoapods.org/
```

### Plugins

```
cocoapods-deintegrate : 1.0.4
cocoapods-plugins     : 1.0.0
cocoapods-search      : 1.0.0
cocoapods-stats       : 1.1.0
cocoapods-trunk       : 1.4.1
cocoapods-try         : 1.1.0
```

### Podfile

```ruby
platform :osx, '10.11'

# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
ENV['COCOAPODS_DISABLE_STATS'] = 'true'

project 'Runner', {
  'Debug' => :debug,
  'Profile' => :release,
  'Release' => :release,
}

def parse_KV_file(file, separator='=')
  file_abs_path = File.expand_path(file)
  if !File.exists? file_abs_path
    return [];
  end
  pods_ary = []
  skip_line_start_symbols = ["#", "/"]
  File.foreach(file_abs_path) { |line|
      next if skip_line_start_symbols.any? { |symbol| line =~ /^\s*#{symbol}/ }
      plugin = line.split(pattern=separator)
      if plugin.length == 2
        podname = plugin[0].strip()
        path = plugin[1].strip()
        podpath = File.expand_path("#{path}", file_abs_path)
        pods_ary.push({:name => podname, :path => podpath});
      else
        puts "Invalid plugin specification: #{line}"
      end
  }
  return pods_ary
end

def pubspec_supports_macos(file)
  file_abs_path = File.expand_path(file)
  if !File.exists? file_abs_path
    return false;
  end
  File.foreach(file_abs_path) { |line|
    return true if line =~ /^\s*macos:/
  }
  return false
end

target 'Runner' do
  use_frameworks!
  use_modular_headers!

  # Prepare symlinks folder. We use symlinks to avoid having Podfile.lock
  # referring to absolute paths on developers' machines.
  ephemeral_dir = File.join('Flutter', 'ephemeral')
  symlink_dir = File.join(ephemeral_dir, '.symlinks')
  symlink_plugins_dir = File.join(symlink_dir, 'plugins')
  system("rm -rf #{symlink_dir}")
  system("mkdir -p #{symlink_plugins_dir}")

  # Flutter Pods
  generated_xcconfig = parse_KV_file(File.join(ephemeral_dir, 'Flutter-Generated.xcconfig'))
  if generated_xcconfig.empty?
    puts "Flutter-Generated.xcconfig must exist. If you're running pod install manually, make sure flutter packages get is executed first."
  end
  generated_xcconfig.map { |p|
    if p[:name] == 'FLUTTER_FRAMEWORK_DIR'
      symlink = File.join(symlink_dir, 'flutter')
      File.symlink(File.dirname(p[:path]), symlink)
      pod 'FlutterMacOS', :path => File.join(symlink, File.basename(p[:path]))
    end
  }

  # Plugin Pods
  plugin_pods = parse_KV_file('../.flutter-plugins')
  plugin_pods.map { |p|
    symlink = File.join(symlink_plugins_dir, p[:name])
    File.symlink(p[:path], symlink)
    if pubspec_supports_macos(File.join(symlink, 'pubspec.yaml'))
      pod p[:name], :path => File.join(symlink, 'macos')
    end
  }
end

# Prevent Cocoapods from embedding a second Flutter framework and causing an error with the new Xcode build system.
install! 'cocoapods', :disable_input_output_paths => true
```

### Error

```
LoadError - library not found for class Digest::SHA256 -- digest/sha2.so
/Users/lvzx/.rvm/rubies/ruby-2.0.0-p598/lib/ruby/2.0.0/digest.rb:12:in `const_missing'
/Users/lvzx/.rvm/rubies/ruby-2.0.0-p598/lib/ruby/2.0.0/digest.rb:87:in `const_get'
/Users/lvzx/.rvm/rubies/ruby-2.0.0-p598/lib/ruby/2.0.0/digest.rb:87:in `Digest'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/lib/cocoapods/project.rb:47:in `initialize'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/lib/cocoapods/installer/xcode/pods_project_generator/project_generator.rb:82:in `new'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/lib/cocoapods/installer/xcode/pods_project_generator/project_generator.rb:82:in
`create_project'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/lib/cocoapods/installer/xcode/pods_project_generator/project_generator.rb:73:in
`generate!'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/lib/cocoapods/installer/xcode/single_pods_project_generator.rb:16:in `generate!'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/lib/cocoapods/installer.rb:308:in `block in create_and_save_projects'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/lib/cocoapods/user_interface.rb:64:in `section'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/lib/cocoapods/installer.rb:303:in `create_and_save_projects'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/lib/cocoapods/installer.rb:294:in `generate_pods_project'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/lib/cocoapods/installer.rb:173:in `integrate'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/lib/cocoapods/installer.rb:162:in `install!'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/lib/cocoapods/command/install.rb:52:in `run'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/lib/cocoapods/command.rb:52:in `run'
/Users/lvzx/.rvm/gems/ruby-2.0.0-p598@global/gems/cocoapods-1.8.4/bin/pod:55:in `<top (required)>'
/Users/lvzx/.rvm/rubies/ruby-2.0.0-p598/bin/pod:23:in `load'
/Users/lvzx/.rvm/rubies/ruby-2.0.0-p598/bin/pod:23:in `<main>'
```

――― TEMPLATE END ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――

[!] Oh no, an error occurred.

Search for existing GitHub issues similar to yours:
https://github.com/CocoaPods/CocoaPods/search?q=library+not+found+for+class+Digest%3A%3ASHA256+--+digest%2Fsha2.so&type=Issues

If none exists, create a ticket, with the template displayed above, on:
https://github.com/CocoaPods/CocoaPods/issues/new

Be sure to first read the contributing guide for details on how to properly submit a ticket:
https://github.com/CocoaPods/CocoaPods/blob/master/CONTRIBUTING.md

Don't forget to anonymize any private data!

Looking for related issues on cocoapods/cocoapods...

Uncaught TypeError: func.call$1 is not a function
    at Client.callback$7 (event_emitter.dart:29)
    at EventEmitter_emit_closure.call$1 (event_emitter.dart:64)
    at Interceptor.forEach$1 (js_array.dart:257)
    at Object.forEach$1$ax (main.dart.js:7204)
    at Client.emit$5 (event_emitter.dart:63)
    at Client._handleNotification$1 (client.dart:506)
    at Object.eval (eval at Closure_forwardCallTo (js_helper.dart:2182), <anonymous>:3:41)
    at Peer.callback$7 (event_emitter.dart:29)
    at EventEmitter_emit_closure.call$1 (event_emitter.dart:64)
    at Interceptor.forEach$1 (js_array.dart:257)

Uncaught Error: undefined
    wrapException js_helper.dart:1129
    firstWhere$2$orElse js_array.dart:327
    firstWhere$1 main.dart.js:40658
    2 meeting_page.dart:64
    protected main.dart.js:7440
    call$2 async_patch.dart:340
    _asyncStartSync async_patch.dart:245
    call$2 meeting_page.dart:64
    callback$7 event_emitter.dart:32
    call$1 event_emitter.dart:64
    forEach$1 js_array.dart:257
    forEach$1$ax main.dart.js:7204
    emit$5 event_emitter.dart:63
    emit$3 main.dart.js:53619
    _handleNotification$1 client.dart:514
    anonymous main.dart.js line 4671 > Function:3
    callback$7 event_emitter.dart:29
    call$1 event_emitter.dart:64
    forEach$1 js_array.dart:257
    forEach$1$ax main.dart.js:7204
    emit$5 event_emitter.dart:63
    emit$2 main.dart.js:53613
    call$1 peer.dart:120
    callback$7 event_emitter.dart:29
    call$1 event_emitter.dart:64
    forEach$1 js_array.dart:257
    forEach$1$ax main.dart.js:7204
    emit$5 event_emitter.dart:63
    emit$2 main.dart.js:53613
    call$1 main.dart.js:102223
    1 websocket_web_impl.dart:36
    protected main.dart.js:7440
    call$2 async_patch.dart:340
    _asyncStartSync async_patch.dart:245
    $call$body$WebSocketImpl_connect_closure websocket_web_impl.dart:30
    call$1 websocket_web_impl.dart:30
    call$1 html_dart2js.dart:37188
    invokeClosure js_helper.dart:1825
    function main.dart.js:4533