CHARMM Development Project Forums User Discussion & Questions Installation and Testing open unit problem

hi everybody i have a big problem regarding the charmm installation.
I always run c31b1 on my mac and i've installed on fedora core 6 in the past this charmm version and it always run.
but today I re-installed c31b1 on FC 6 and charmm give me some problems. I mean it works but when i run some script it didn't open any kind of unit..it said that :
CHARMM> !Read the RTF and parameter files
CHARMM> OPEN READ UNIT 11 CARD NAME param.prm
VOPEN> Attempting to open::parbna.prm::
OPNLGU> Unit 11 cannot be opened as PARAM.PRM

and the privileges on that file are rwx so...
someone can help me???

The different name reported by VOPEN is odd ...

Note that c31b1 is not very 64-bit aware, so you might get odd results compiling on an x86_64 Linux machine unless you explicitly modify Makefile_gnu to force 32-bit mode via the -m32 compiler argument. You must also have the appropriate 32-bit compatibility software installed.

Most likely the case of the file name is important - it is converted to upper case unless enclosed in quotes. This is a very old behaviour in CHARMM.

Actually, both all upper and all lower case are tried; only mixed case names require the double quote char (").

thank you for your advices.
best