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M204.0634  Trouble with disk I​/​O​,​ possible incorrect DD card​,​ file​=​"token"

Model 204 encountered an error trying to read or write to the file. This often results from issuing an OPEN command for a file that has not been created.

Response: Check the JCL and the data set for errors.

Message attributes:

RETCODEO=0Sets online return code
RETCODEB=4Sets batch (single user) return code
CLASS=EError class; the message can be suppressed with the X'04' bit setting of the MSGCTL parameter
AUDITERWrites the message with line type ER to the audit trail
COUNTIncrements the error count (ERCNT) parameter
ECHODisplays the line that caused the error

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