Has anyone ever come across this error?

 
Hi,
Does anyone know why i would get : (Tester : exchange rate cannot be calculated mx4) and (Tester: margin exchange rate cannot be calculated)on certain pairs? I googled and searched the forum but i can't find anything. Can i remove part of a code that checks for this, and if so which part would it be? Or what would i need to do to fix this?
Cheers,
Ramy
Reason: