The scheduling granularity for the project is set to start and end all tasks on hour boundaries, but the locked start date for this task occurs between hour boundaries.

To resolve this, do one of the following:

  1. Unlock this task, which will allow it to be scheduled when its prerequisites have been completed on %1@
  2. Move the locked date earlier to the previous hour boundary, %2@, or
  3. Move the locked date later to the next hour boundary, %3@, or
  4. Change the project scheduling granularity to Exact Scheduling.