Is your email spelt correctly? If it is try the "I forgot my password button" to see if it actually already registered. If it is you will get an email to that address with a password reset link. Reset password and you should be able to use your email.
There is a Message limit on Android to only allow a certain amount of messages per conversation. I only have studied Apple devices through my Ipod so I wouldn't know if there was a setting like this. If there is try dropping your message limit to a lower number. Dennis and one of the mobile masters...
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