CFX-Post can't read .gtm file

Atit

I use CFX 5.6 on Windows2000. Today I found the problem that CFX-Post can't read GTM file. After complete all forms in Build I do as many times I do before use GTM file, I select "Start CFX-Post with GTM file". And I got the dialog box named "Program Error", it say that "gtmconvert.exe has generated errors and will be closed by Windows. You will need to restart the program". and also the dialog box say "Unable to load file: C:/CFX/work9APR04/similarity/Prototype/NoMC.gtm The only file types which CFX-Post can currently read are:

1) Definition and Results files from CFX-5.4 or later

2) CFX-5 GTM files

3) FCX-4 Dump files

4) CFX-TASCflow files (must have grd/rso, bcf and prm files)."

I try to open other GTM files that I have ever used successfully. They all can't read by Post. Do anyone know what the problem is? How to fix this? and what is "gtmconvert.exe"? I found the first error message sometimes when CFX-Solver got the problem.

Thank you very much.

Atit