Additionally, I get strange error messages:
60 'Could not get source, probably due dynamically evaluated source code.'
File sage/structure/element.pyx:494, in sage.structure.element.Element.__getattr__()
--> 494 'Could not get source, probably due dynamically evaluated source code.'
File sage/structure/element.pyx:507, in sage.structure.element.Element.getattr_from_category()
--> 507 'Could not get source, probably due dynamically evaluated source code.'
File sage/cpython/getattr.pyx:357, in sage.cpython.getattr.getattr_from_other_class()
--> 357 'Could not get source, probably due dynamically evaluated source code.'