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I have installed fastell4py on a remote HPC. When I want to import it however (such as in Lenstronomy) I am faced with the following error:
File ".../python3.6/site-packages/lenstronomy/LensModel/Profiles/spemd_smooth.py", line 20, in __init__ from fastell4py import fastell4py File ".../python3.6/site-packages/fastell4py-0.1.0-py3.6-linux-x86_64.egg/fastell4py/fastell4py.py", line 14, in <module> from fastell4py import _fastell ImportError: .../python3.6/site-packages/fastell4py-0.1.0-py3.6-linux-x86_64.egg/fastell4py/_fastell.cpython-36m-x86_64-linux-gnu.so: cannot dynamically load executable
The reason could be, that _fastell.cpython-36m-x86_64-linux-gnu.so was compiled without the -shared flag. However I am not sure about this. since I do not receive the above mentioned error on my local machine.

Does anyone know a possible solution?

So I am a student and i have gone through the paper and since i am better at python hence using this which was a great help. I think it's not an issue but maybe because i am a novice at this , fastellmag basically should pull out the Jacobean as in the manual , but while going through the commands i have a doubt , f_xx , f_yy, fxy is this the different component of the Jacobean if not how do I pull out the Jacobean i mean with what command.

I need to calculate the caustic curves for that we need to set the condition detA =0 now this A is the the Jacobean matrix or the Magnification matrix. I am doing a project and came upon a hurdle which led me to rethink my steps ..... So can you clarify this .....
Thanks