error free compiled file while loading gives "can not load file ERROR" in MT4

 

I am using MT4 build 971. I am getting an error when I am attaching certain indicator to any chart. I have compiled that indicator without any error and then trying to attach to chart but I get error message "can not load <file path/fileName.ex4>  error. Sometime when I restart my MT4 platform by closing and opening it again I am able to load the same file without any error but after a while randomly I get this error.  Has anyone encountered such problem?  I will greatly appreciate if someone can give me more insight into this kinda error which will help me resolve this issue.

Thanks