AWS other modules cant be imported as soon as psycopg2 module is installed

Question

I have installed some python libraries ands added them to a layer of a function. I have got the error which said "errorMessage": "No module named 'psycopg2'" So I installed the psycopg2 module and added the zip file again to the layer as new version. But now neither the psycopg module more all other modules which I import in my lambda-function.py script can be imported. [ERROR] Runtime.ImportModuleError: Unable to import module 'lambda_function': No module named 'pandas' Traceback (most recent call last):

When I use the layer version which doesnt contain the psycopg2 library the code runs well till the point which a connection to postgres DB is necessary.