Errors in scene when UMA installed but not used about uma

[Jaimi]

This is by design if you have a recipe selected. If you have a recipe selected, and the open scene does not have a UMAContext, then it needs to create one to be able to show the editor. Before we did this, it would simply error out with an access violation. We tried an iteration where we notified the user that a scene with a "valid umacontext must be open to be able to the see recipe", but that fell flat also. In the end, we compromised on just making a context, and then cleaning it up when the editor was closed.

So in your case, you must have a recipe selected (the recipe editor is what is throwing the error).
We will be rewriting the whole library/context/etc stuff in version 3.0 so this will no longer be a problem. Closing this issue due to a trello task already existing to address it.