without seeing the entire code i cant help much but
go to your html output (i.e. view source in your browser)
and look for the hidden input
<input type=hidden name=receiver value=x>
see what the value is .. it should be outputting the value of $user['id'] but from the error im guessing it is not .. either that or the code in userdetails uve added doesnt account for id being sent via post and is wanting the id var sent by GET .. as i said without seeing the mod you've installed as well as the code uve added i cant help
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