This message comes up when trying to do copy to startup-config on Cisco 7604 router with SUP32 module.
The problem became worse and worse and later customer could not even do a show log show run or show startup.
All these commands would just return to the prompt with no output at all from teh command, including the reload command.
Finally he had to reboot ( by turning OFF / ON )the Cisco 7604 to get over the problem.
Vrsion of IOS is:
12.2(33)SRB and the file name is:
Forwarding of user traffic was still Ok in spite of these problems.