CASCS1135S Error creating configuration save file, reason = RC-1

An error occurred when creating the configuration save file.
Note:

Rocket® Enterprise Suite products provide a proprietary run-time engine to enable compatibility for customers’ IBM® CICS® applications. IBM and CICS are registered trademarks of International Business Machines Corp. Rocket Enterprise Suite products do not include an IBM CICS engine and are not affiliated with IBM.

System Action:
The CCI gateway will not initialize successfully.
Resolution:
Check directory permissions and disk space.
Module:
dfhtcci
Destination:
Console