I am trying to import an .mpp file but keep getting the following error message, "Assign all tasks to 'Any User' who is available in...[name of file]"  I tried everything I know in MS Project to fix the issue to no avail. I even created a user named 'Any User' to see if that would work...no joy.

Please advise. I checked the forum and didn't find anyone else with the same issue. I am using the free as a trial. If I can't import .mpp files I won't be upgrading because it is a necessary function for our company.