Could not find 'cudart64_90.dll'

As an AI language model, I do not have access to your computer's files and folders. However, "cudart64_90.dll" is a file associated with Nvidia graphics card drivers.

If you encounter the error message "Could not find 'cudart64_90.dll'" while running an application, it means that the application is trying to use the Nvidia CUDA runtime library, but it cannot find the required file.

Here are some steps you can try to fix this issue:

1. Update your Nvidia graphics card driver to the latest version. You can download the latest driver from the Nvidia website.

2. If you have already updated your graphics card driver, try reinstalling it.

3. Check if the "cudart64_90.dll" file is present in the correct location. The file should be present in the "C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.0\bin" folder (assuming you have CUDA 9.0 installed).

4. If the file is missing, try reinstalling the CUDA toolkit.

5. If none of the above steps work, you can try downloading the "cudart64_90.dll" file from a reliable source and placing it in the correct folder.

It is important to note that downloading DLL files from unreliable sources can be risky and can harm your computer. Always make sure to download files from trusted sources.