Build error - DirectoryNotFoundException: Could not find a part of the path

Hello,
I am unable to build my project in Unity (PC version) due to this error. Can someone please help me resolve this.

DirectoryNotFoundException: Could not find a part of the path "Assets\StreamingAssets\VR Controllers Models\Oculus Controllers\oculus_cv1_controller_left\Materials\external_controller01_col.mat" or "Temp\StagingArea\Data\StreamingAssets\VR Controllers Models\Oculus Controllers\oculus_cv1_controller_left\Materials\external_controller01_col.mat"

Thank you!

 

You neglected to state whether the file above actually exists in your project.

This also seems odd to be accessing a Unity file (a .mat file) but doing so in the StreamingAssets folder.

Did you set the project up this way? StreamingAssets is for binary non-Unity stuff.

I'm not even sure that is actually even a possible thing because how would you turn the .mat file (which is YAML) into an actual Material at runtime...

 

The file is missing in the Temp..... path. It is there in the Streaming Assets path.