Instagram / HTC One X SignUp issue

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http://forum.xda-developers.com – Hi, I tried signing up with Instagram and it gave me an error that too many users have been registered on my device. I only have one other account which I registered a long time ago from my phone. I have tried going into Settings > Apps > deleting cache and app data but still it gives that error. Is there a way I can solve this problem? (maybe delete some database files, etc) .. or Do I have to wipeclean my device and start from scratch? Any help would be extremely appreciated. Thanks ~N (HowTos)