Question [Q] How to fix a CWM boot loop?

I installed a custom rom for my Galaxy Player 3.6(YP-GS1) and I can't figure out how to fix this error.

First it boots like normal then straight into cwm. After a brief time it reboots by itself. I think I know how to fix but I don't know how to flash a rom with an external sdcard. And It seems that whenever I try to install from my internal sdcard it gives me an error like my internal storage is corrupted.
The error says
-- Installing R0m.zip
Finding update package...
Cannot mount sdcard/R0m.zip
Installation aborted
I would be very greatful to whoever can fix my issue.