CA WA Job reports the following error:
Microsoft Excel cannot open or save any more documents because there is not enough available memory or disk space. To make more memory available, close workbooks or programs you no longer need. To free disk space, delete files you no longer need from the disk you are saving to ...
The job or script is failing due to permissions issue. The message as displayed is most likely not related to memory or disk space.
CA WA Agent
The files need to be allowed to be opened.
See this link from Microsoft for more details.