''already a gmail account on this phone''??

[trevmelbourne]

HI i swapped sim cards in my phone (xperia mini pro sk17i) and when i put the usual one back in it took me to setup and i put in my usual gmail email address and it wont let me sign into my gmail account, it says ''there is already a @mygmail on this phone'' and that it already exists, but, i can't USE it, i can't use play store or facebook or anything, how do i access my gmail account thats already on it? im so confused lol

 

[Jake-SonyXperia]

Can you please go to the following section and tell me if there is an account there,

Menu > Settings > Accounts & Sync

Let me know.