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Error: Unable to append cover .pff file (APFILS)

Solution or Workaround

Error Message:

When the PAL file is missing or corrupt in one or more coverages, the following error message is returned:

"Unable to append cover .pff file (APFILS)
Bailing out of APPEND..."

Solution:

1. MAPJOIN groups of coverages to isolate the suspect coverages.
2. BUILD or CLEAN the coverages.

MAPJOIN should now process without the error message being returned.

Note:
It is also possible that the mask (MSK) file in the coverage directory may be corrupted. It can safely be deleted, and then run BUILD or CLEAN to update the topology.