virtual hosting

 
i keep getting message; ( Migration to virtual hosting failed:old EX4 file version.   Please recompile.and migrate again) iam not sure how to do this.
 
It means that your ex4 file was compiled with old version of MetaEditor/Metatrader (older than Metatrader in virtual hosting).
You shiould compile it again with the latest Metatrader/MetaEditor build (or ask the coder to compile).
Reason: