when i logged via console , the following messages appeared .
Dec 17 08:50:19.618: %SYS-2-CHUNKEXPANDFAIL: Could not expand chunk pool for ipnat globaltr. No memory available -Process= "Chunk Manager", ipl= 4, pid= 1, -Traceback= 0x60046F6Cz 0x62C31434z 0x62C31418z
What type of router or switch is it?. Since there is no image on the flash or it is corrupted, you may have to use xmodem to load a new IOS to your flash and than try to rebooting it. The error message appears to be a memory issue.
I believe that Leo has correctly identified what is going on. You could confirm it by looking at the output of show version from the router. There is a line in the output that shows the name of the image file and I am confident that it will show that the image name is y.
I have seen things like this before where someone did not understand the prompts from the Cisco copy command. The copy command was asking that they confirm the file name to be used and the user responded with y believing that yes would confirm the name to use but in fact the router then takes y as the file name.
The original error reported is almost certainly the result of a memory leak. It is likely that it will occur again and a reboot is the only way to fix it once it starts. To prevent it from happening would require loading a different image.
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