# [Solved] fatal error: cuda_runtime.h: No such file or directory

Background

Today, I want to run a yolact model, but in the process of training, I need a DCN network model. This requires CUDA to compile relevant files, but an error is reported. The main errors are:

``````	cuda_runtime.h: No such file or directory
``````

I spent an afternoon reading a lot of blogs, but I didn’t solve it. Later I knew why. In fact, the solution is also very simple, that is, add some folder paths of CUDA installation directory to environment variables. The following are the solutions for the windows operating system:

Add the following two paths to the environment variable path:

``````	C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.0\bin
C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v11.0\lib\x64
``````

Basically, everyone’s default installation path is this. You only need to replace ` v11.0` according to their installed CUDA version number.