CASRB0043E Cannot access Resource Definition File - status=file-status (req=request-code res=result-code)

An unexpected error was returned from the Resource Definition file I/O handler (dfherdio).
System Action:
The file is closed (if it was open), and processing continues, if possible.
Resolution:
file-status may provide some insight into the cause of the problem. If not, contact Micro Focus SupportLine.
Module:
dfhpcupg
Destination:
Stdout and rdoupgrd.log