Strange error when merging units

Hi,

When I am trying to run a test, its giving me an error ,attached image. The error is not in the test unit but in the other unit it is attached to. 

The same unit works fine with my BDD scripts, but this test was written by somebody else and throws error for my new unit. I have checked that the For loop syntax is fine. I use Javascript. Apparently, he had written all his units into Javascript but just to check the language, is there any option I can look for in his project to confirm the language.

Thanks