Strange Error with CCEdit 2.0

[M11k4]

The file you have is corrupt. Maybe you copied it from somewhere and that process was interrupted, so the file does not have an "end marker". If you try to play the set in TW without passwords, you'll most likely see some of the levels there but not all of them. The last level listed can also have an odd name. A similar message I've come across is "read past end of stream". If possible, just download the set again, or revert to an earlier saved copy.