Scale & for time axis does not exist

What causes this issue?

There is no scale for the time axis &V1&.

System Response

INCLUDE 'NA_ALLG_NOVERARBEITUNG OBJECT DOKU ID TX

How to fix this error?

INCLUDE 'NA_ALLG_VORGEHEN' OBJECT DOKU ID TX
Check your settings in Customizing for the project planning board.
RESET N1
Define a new scale for the time axis, if necessary.
Enter a different scale for the time axis in the profile for the project
planning board.

Error message extract from SAP system. Copyright SAP SE.