Msg. error when create process group in DIXF.

Dear Expert,

I got the message error from environment Test when using module: DIXF on function Create process group

Error msg. "Could not load file or assembly 'Microsoft.Dynamics.AX.DMF.PreviewGrid, Version=1.0.0.8, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified."

Could anyone advise me or give solution for solve this issue.

Thank you in advance.

PrasitP.