Keywords: IP, sources, Project Navigator, added
A core is generated successfully through Project -> Create New Source. However, the .xco file is not added to the Project hierarchy in the Sources window even though the "Add to Project" option is selected. The following error is written to the ISE console:
"ERROR: A Core Generator generated file <core_name>/simulation/glbl.v does not exist in the project directory!"
This error is written out for every file in the simulation directory.