Generally, when the file does not match the action step. Such as when the action creates a selection from transparency and the files is flat, or the action uses a specific layer name the file does not match.
it would be helpful to post a cropped screenshot of the action with all steps expanded and the exact error etc.
A requirement for the step to execute may not exist. Action steps can depend on something for execution. For example modify selection will not be available if there is no active selection. That a typical error you get when actions are not well crafted. Action can only test a few conditions. They can test if there is a selection. However, action can not test for many things. So if some step may fails to do something an other steps relied on the step the relied on the something will fail with "command x" is not available.