Given that you posted in the a) legacy section and b) without the exact and complete error message you receive, I must guess that this KB applies to your situation:
KB25553 "There are too many PIN changes associated with this account (Error ID: 30801)" is encountered when attempting to login to BlackBerry World
Good luck and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.