Compiler Error C0180
Message: Ambiguous namespace '<library 1>' defined by library '<library 2>'
Possible error cause: The namespace of the library <library 1> is not unique. It is already used for <library 2>.
Error correction: Change the namespace of the library accordingly (Properties button in the Library Manager).
Example 416. Example of the error:

Message:
C0180: Ambiguous namespace 'STANDARD' defined by library 'Standard, 3.5.15.0 (System)'