SIgnals Notebook: When users want to add materials they get the following error message: 'This operation fails due to invalid input data or misconfiguration'.Materials are properly activated as the admin can add them. How can I solve this issue

When users want to add materials they get the following error message:
'This operation fails due to invalid input data or misconfiguration'.
Materials are properly activated as the admin can add them.
How can I solve this issue?

Log in as Admin user, go to System Configuration - Security Policy and add following test (if the text is already present, remove “#” commenting symbols at the start of each string to make statement active):

##Grants access to the Materials folder.
Rule"Materials Policy"
IF attribute "Material Library Type" match
THEN grant "entity.write"


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