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 of the error:

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