PRGZ-01241
The version of Aplication Express (APEX) installed on source database {0} is different than the version installed on target database: {1}
Cause
An attempt to migrate a database with non-CDB to PDB conversion was rejected because the version of APEX installed on source database is different than the one installed on target database.
Action
Ensure that either source database has no APEX installation or that target database has the same version of APEX installed and then retry the operation.