*Unknown error occurred while loading* main scene file

I use git for version control and I have already setup a .gitattributes/Git LFS to handle text/binary file versioning. While this has been fine and good for weeks, today one of my work machines starts to show this error on project open: "Unknown error occurred while loading Assets/Scenes/Main.unity".

I have cleaned up my folder and git checkout again to no avail. The crazy thing being, Unity on my other machines, which are the same version 5.4.0f, can open my project just fine. My repos are up-to-date, so something must be missing? But I have no idea what. Here is my gitattributes file for reference:

 ## Unity ##
 
 *.cs diff=csharp text
 *.cginc text
 *.shader text
 
 *.mat merge=unityyamlmerge eol=lf
 *.anim merge=unityyamlmerge eol=lf
 *.unity merge=unityyamlmerge eol=lf
 *.prefab merge=unityyamlmerge eol=lf
 *.physicsMaterial2D merge=unityyamlmerge eol=lf
 *.physicsMaterial merge=unityyamlmerge eol=lf
 *.asset merge=unityyamlmerge eol=lf
 *.meta merge=unityyamlmerge eol=lf
 *.controller merge=unityyamlmerge eol=lf
 
 ## git-lfs ##
 
 # Image
 *.jpg filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.png filter=lfs diff=lfs merge=lfs -text
 *.gif filter=lfs diff=lfs merge=lfs -text
 *.psd filter=lfs diff=lfs merge=lfs -text
 *.ai filter=lfs diff=lfs merge=lfs -text
 
 # Audio
 *.mp3 filter=lfs diff=lfs merge=lfs -text
 *.wav filter=lfs diff=lfs merge=lfs -text
 *.ogg filter=lfs diff=lfs merge=lfs -text
 
 # Video
 *.mp4 filter=lfs diff=lfs merge=lfs -text
 *.mov filter=lfs diff=lfs merge=lfs -text
 
 # 3D Object
 *.FBX filter=lfs diff=lfs merge=lfs -text
 *.fbx filter=lfs diff=lfs merge=lfs -text
 *.blend filter=lfs diff=lfs merge=lfs -text
 *.obj filter=lfs diff=lfs merge=lfs -text
 
 # Others
 *.a filter=lfs diff=lfs merge=lfs -text
 *.exr filter=lfs diff=lfs merge=lfs -text
 *.tga filter=lfs diff=lfs merge=lfs -text
 *.pdf filter=lfs diff=lfs merge=lfs -text
 *.zip filter=lfs diff=lfs merge=lfs -text
 *.dll filter=lfs diff=lfs merge=lfs -text
 *.unitypackage filter=lfs diff=lfs merge=lfs -text
 *.aif filter=lfs diff=lfs merge=lfs -text
 *.ttf filter=lfs diff=lfs merge=lfs -text
 *.rns filter=lfs diff=lfs merge=lfs -text
 *.reason filter=lfs diff=lfs merge=lfs -text
 *.lxo filter=lfs diff=lfs merge=lfs -text
 

Suggestions are much appreciated.