This is normally caused trying to load a copy of module PSACOEC0 into storage
but it cannot because there is already a version there.
Normally this is a copy from a previous release.
Things to Check
1) There is not a copy in the linklist
2) The Apf libraries do not hold a copy of the module
3) Check that the Xmanager job is using the correct and current datasets
4) Verify the datasets in the DSNAMExx member of the CDBAPARM library are correct