'<attribute>' cannot be applied because the format of the GUID '<number>' is not correct

A COMClassAttribute attribute block specifies a globally unique identifier (GUID) that does not conform to the proper format for a GUID. COMClassAttribute uses GUIDs to uniquely identify the class, the interface, and the creation event.

A GUID consists of 16 bytes, of which the first eight are numeric and the last eight are binary. It is generated by Microsoft utilities such as uuidgen.exe and is guaranteed to be unique in space and time.

Error ID: BC32500

To correct this error

  1. Determine the correct GUID or GUIDs necessary to identify the COM object.

  2. Ensure that the GUID strings presented to the COMClassAttribute attribute block are copied correctly.

See Also

Attributes overview