Global variable 'cudalib' is not declared.

[yys123456]

I have

1. installed visual studio 2013
2. installed CUDA 7.5(works on my machine), made sure CUDA_PATH was added to system PATH and visual studio integration was installed
3. downloaded terra and add terra/bin to PATH
4. made the project tree like this
   
5. run buildOpt.bat

But when I went to Optlang\Opt\tests\minimal folder and tested whether it can work properly, I got the error below:

Global variable 'cudalib' is not declared. Global variables must be 'declared' through a regular assignment (even to nil) at global scope before being used.
My operating system is windows 10