CWSIS1561E errors are usually caused by deleting the messaging engine, without deleting its filestore, then recreating the messaging engine with the same name. To fix the issue, you will have to delete the existing filestore files for the messaging engine and restart the JVM. A new filestore will be created during the messaging engine startup.

Note1: You must treat the log file, the temporary store file, and the permanent store file as one unit; that is, delete operation must be performed on all three files.

Note2:By performing the suggested action, all the messages in the filestore will be lost.