Ctools Multi step form throws error when form_validate is from another file Ctools Multi step form throws error when form_validate is from another file even I had included the file using module_load_include.

As per this example I used a function not from the current file but by using module_load_include this is working fine. But when it comes to form_validate it is throwing an error.

Any suggestions?
Figured it out, we need to include using the below function 

form_load_include($form_state, 'inc', 'module_name', 'module_name.file');