I don't see any problems with the input; however, the error message suggests there are non-printing control characters present in the file. While one possibility for that is accidental file corruption, sometimes this can occur for files which have been edited on a Windows or Mac OS X machine and then transferred to a Linux machine to run CHARMM. Note that TAB characters are not allowed in CHARMM input scripts. You may need to consult with a local computer guru to help you with this.

One thing you can try is to make a new file by using a graphic cut-and-paste from the old file to a new file, using a text editor on the Linux system. In principle, this should not copy any non-printing characters which may be causing trouble.

Rick Venable
computational chemist