ESP528E ERROR OCCURRED PROCESSING EVENT <event name>
ESP2720E UNABLE TO ALLOCATE <jcl name>, S99 ERROR CODE X'0238', INFO CODE X'0000'
ESP1800I ABOVE ERROR OCCURRED ON FOLLOWING STATEMENT
ESP1007I JCLLIB '<jcl name>'
If there are thousands of jobs in the CSF queue, the dataset will be allocated that many times - filling up the table.
Add the ESP REXX function "FREEX" in the APPL and recycle ESP to free the allocated datasets.