There is an easy fix to the error 4.
http://www.wikihow.com/Remove-a-Stuck-CD-from-a-Car-CD-Player?fb_action_ids=10151851927196473&fb_action_types=og.likes&fb_source=other_multiline&action_object_map={%2210151851927196473%22%3A439067082600}&action_type_map={%2210151851927196473%22%3A%22og.likes%22}&action_ref_map=[]
I tried a card similar to a credit card and used a tape inside out. After inserting to the player, i lowered it using a micro screwdriver. The CD's did not come with the cars as explained in the link but it activated the CD loading mechanism. I switched on the player and i was able to eject all the 6 cd's out of the player and player is back to normal with no errors.
The cd's were stuck in the player for nearly 6 months with no damage. I have tried everything from removing the batteries and removing the fuses but it did nothing. Now, I can still play all those stuck cd's in the same player.
It does not like it is the problem with the CD's but it appears to be an issue with the loading mechanism.
I am not going to load 6 cd's at the same time anymore.
Let me know if this helped anyone!