Take the cover off of the top of deck and watch the tape loading. Make sure that the door on the cassette is getting flipped up and the tape is getting pulled out of the cassette and wrapped around the drum. Just watch the machine try to thread up. I’m guessing that something is preventing the cassette door from opening up, especially if other tapes will work. Also make sure, by opening the cassette door manually, that the tape hasn’t broke inside the cassette. You should be able to see it stretched from reel to reel within the cassette shell when the little door is flipped up. If the tape is broken, the machine will not be able to thread it up properly and the deck’s computer will kick it back out for safety. Tape within cassettes has been know to get severed or simply pulled loose from the supply or takeup reel during a hard rewind or fast forward. Also, is it the only tape that will not load. Will other tapes the same size and length load properly? Sometimes the sensors in the deck fail to recognize the size of the cassette and will not move the reel tables into the correct positions. This will cause an error as well and eject the cassette for safety. Finally, does the reels in the cassette turn freely. The tape could be jamed which will also prevent the deck from threading properly.
Tom