It's easy to search the Adobe help system for PrPro for "supported file formats" ... that gives a rather complete list.
And here's a screen-grab of the supported audio file formats from that page:
Note that .m4a is listed as supported within the latest series (2015.3/4 10.x builds) of PrPro.
How are you importing this? If you aren't, please use the Media Browser window, navigate to the file & select it, then right-click and "import". Then drag/drop the file from the Project panel. See if that works.
Thanks for the reply. But I'm doing something wrong or your solution is not working.
I load Adobe Premier Elements 14. Once the project is completely installed, I click on Add Media and go to the music I want to add. I select the music and immediately get the error message The importer reported a generic error. The music file has a .m4a extension and works if I click on it while not in Premier Elements.
Thanks again for the reply
Well, this is the forum for Premiere Pro, not Premiere Elements. That might make a difference ...
And here's the page of that program's manual for supported file formats ...
And from that page, the supported audio formats ...
What is the source of the file? Is it iTunes?
I'm with Bill. iTunes includes software that keeps you from using their music in a video project. Trying to do so will cause a generic error.