I cant update all of my documents suddenly, help!!!!

And I got the following message:
"error:java.io.IOexception:Index file is of wrong size."

I am using Sunrise 4.0a, what's wrong?

The cache index has become corrupted. Delete the ".sunrise\cache" directory in the user home directory. The cache will be recreated the next time you run an update.

The user home directory differs across Windows configurations. On Windows XP/200 it's typically:
c:\Documents and Settings\<username>\.sunrise\cache

What can cause this? I just had the same problem with a slightly different error. Deleting the cache did fix it.

java.io.IOException: Buffer underflow while reading index file: null

This is due to the cache index not having been flushed properly the last time it was written to disk. This, in turn, may be caused by the premature termination of the VM or a bug in the cache itself.

Will look into this later. For now, you should delete the cache manually.