ERROR: Attached source ... prevents drop of port ...

Reason:

You attempted to drop a port using drop_port() but one or more sources are attached to it.

Resolution:

Ensure you specify a port without sources attached to it.

Tips:

• Detach the sources first, then drop the port. You will need to terminate any agent processes that are using those sources.
• Use the star$sources view to find the sources attached to the port.