sorry if in wrong place, seen a few error requests here:)

hi i am new here and to zen carts.

i have created an account on www.ta2supply.us and was all fine:)

now when i try to loggin i get this message:
There was a security error when trying to login.

i can request a new password and that all works fine, but still same error message when try to log in:)

please please help me fix this:)

thanks so so much joe