This worked for me as well.
If you happened to re-run the phase without addressing the issue you may seeing something like
Caused by: com.sap.sql.exception.OpenSQLIntegrityConstraintViolationException: ORA-00001: unique constraint (UNKNOWN.obj\#=3089759) violated
which would send you down the wrong path
Look in older JMT_FRAMEWORK_<nn>.ERR files to find the true source of the error, in my case
Caused by: com.sap.sdt.jmt.MigrationException: <--Localization failed: ResourceBundle='com.sap.sdt.jmtx.MigrationToolResourceBundle', ID='icm.id002', Arguments: ['cluster_data/server/ID31934351/services']--> : Can't find resource for bundle java.util.PropertyResourceBundle, key icm.id002