Issue with inserting a custom cover page

I am a beginner of latex and I use lyx as my tool. I finished my document with Lyx and found a cover page template from here(the first template in the page)

I copied the code into my lyx file in the beginning of the page. As instructions says I copied the title page code and then the \titleGP code snippet. But it says it is wrong in compile time. Why is that?