Project &1 does not contain any summarization objects

What causes this issue?

Project &V1& contains no WBS elements requiring summarization.

System Response

This project is not included in the project summarization.

How to fix this error?

Check the master data for project &V1&. For more information, see the
SAP Library under <LS>Project System -> Project Information System ->
Project Summarization</>.

Error message extract from SAP system. Copyright SAP SE.