[Asterisk-Users] Prepaid application error

[tonini . massimo]

Hi, I successfully installed postgres and prepaid application in my asterisk box but after I digited the code
I receive this error:
ERROR:  Function asterisk_authenticate("unknown", "unknown") does not exist
        Unable to identify a function that satisfies the given argument types
        You may need to add explicit typecasts
    -- Playing 'prepaid-no-aaa'

What is wrong ?

Bye