Generation runtime delivered no results; see long text

What causes this issue?

An internal error occurred.
You ran the generation of the data flow. Generation of the objects is
run by its own runtime. At the end of generation, the generated objects
of the data flow are returned internally. In this case, however, none of
these objects were returned. This indicates that an internal error
occurred.

System Response

The data flow for generation is terminated with errors.

How to fix this error?

Analyze the situation and contact SAP if necessary.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.