.msh file instead of .cas file in HS

Hello guys,

I tried the tutorial 'HS-1545: DOE and Optimization Study with HyperMesh, HyperStudy, and ANSYS CFX' and it worked very well.

Now I want to use a .msh file instead of the model.cas file. I thought there should be no problem because it is also a fluent-file.

So I created a new study and went through the steps of the setup. When I reached the 'evalute' step HS was able to write the Input files. But when HS wanted to execute it shows me always the attached picture.

Is it possible to change some terms in the responsible files to avoid this error? Or is it just impossible to use a .msh file?