Garry Thomson / Profil

i keep getting this error

'ggg.mq5' ggg.mq5 1 1
'AccountBalance' - undeclared identifier ggg.mq5 2 39
')' - expression expected ggg.mq5 2 54
2 errors, 0 warnings 3 1
using this basic script
//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+
void OnStart()
{
Print("Testing AccountBalance: ", AccountBalance());
}
any ideas