I put a tape in and it keeps flipping sides without playing and pops out and says Error. It even does it with a CD-Cassette Adapter. Before the Cln came up and I pressed on the eject button and that stopped.

SOUNDS LIKE YOU NEED A NEW DRIVE BELT YOUR CASSETTE IS NOT SPINNING.

They aren't in the same family are will never work together! Take it back!

sounds to me like your tape belt in the other motor has broke ,the drive for the tape deck has a rubber band putting it crudely and these belts are a special rubber ,it should be a easy repair but make sure you get the right size rubber band but they must be made for a tape deck and not one from office draw

you can try to help pop it up and out with a screw driver but if that doesnt work tou may have to take the radio out and disassemble it

You might try flipping the adapter over the other way. If that doesn't work, you might want to try putting a cleaning tape in and clean the cassette heads. The tape player will sometimes eject a tape if it cannot read it very well. It assumes that the tape is damaged. Dirt on your heads can cause it to eject your adapter because it is having trouble reading the signal from the adapter.

I think it's worn out.

I think you need to remove the unit and have it repaired, it is faulty.

I just got a tape unstuck myself. Everytime I would hit eject it would make a clicking noise.

Here is what I did:
First I watched these videos to remove the radio.
http://www.youtube.com/watch?v=29MTa4FLjtk&feature=channel

http://www.youtube.com/watch?v=fqvk_PNo9Kg&feature=channel

Then I unscrewed the bottom panel of the radio.
Unscrew the brass screws holding in the cassette player portion of the radio.
Now flip the cassette player over to see your tape, etc.
When I pressed the eject button, I noticed a little motor with a worm gear would move a a gear which moved several other gears until it eventually moved a black gear which has a little post that moves the metal arm which moves back when pushing in a tape and moves forward when ejecting a tape. But I would get a clicking sound which seemed to be due to one gear trying to move a stuck gear.
I forgot the exact details of how I managed to get the tape out, but when I did get it out I noticed when I turned on the radio, it would act like it was trying to play a tape. But when it found out it couldn't, it would try to eject but would fail once again with the gear clicking sound.
I think I tried moving the black post on the black gear that moves the arm that pushes the tape out. Eventually I got to the point where the arm was pushed forward like it should be when a tape is ejected. At that point I was able to insert and eject a tape without any problems.

sounds like the cassette adapter has a bad channel, or didn't fully seat into place. Try removing and re inserting, to play the other side of the adapter if the wires will allow it. Then auto reverse the cassette deck to allow a different portion of the cassette head to be used for the signal. Those cassette adapters are poor quality, and put alot of time on the mech.

The tape player is probably broke. There may have been pop spilled in there and got it all sticky inside. Use a maglite and look inside the tape player for this or bad dust etc. You will have to replace the player, and you might as well get a cd player since it will not cost you a ton these days. You can use an mp3 player or ipod today, but if you want to use cd's, then install a cd player. You should be able to do this pretty cheap now, maybe $40-60 bucks or so.