GTE (r63B) weird error

Hello,

I am getting this error every time:

http://i.imgur.com/uJk16Va.png

Does anyone know what the cause is of this error? My guess is that it has something to do with banner.php. Because when I change banner.php to banner.png in my vars, I get a black screen after the client has loaded while the emulator is connecting. Are there any other flashVars required for r63B (because I used r63A before and didn't change my client.html).

Thanks in advance!