COBCH1504 I-O error _ <file-status> <file-name>

An I-O file handling operation has failed for <file-name>.

The <file-status> corresponds to an extended file status code of the format 9/nnn (for example 9/181). You can usually cross-reference the second part of the status (181 to use the earlier example) with the definition of the corresponding run-time system error (for example, COBRT181) for more details.