How to integrating adminlte to laravel 5?

I want to use adminlte template to laravel 5. I have downloaded source code from here.

The first trying, I have got an error something about "vendor", and after looking the solution from the internet it's because I have no vendor folder in source code that I have downloaded. After I am adding a vendor folder from my new laravel installation, I have got an error "Whoops, looks like something went wrong." just it.
Do you know how to solve it?

via Chebli Mohamed