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Visual Studio for Mac, how to debug solution load failure?

VS version: Visual Studio for Mac 17.5,
OS: macOS Monterey Version 12.6.3,
Hardware: Mac mini (Late 2014)

This solution is for an iPhone and Android application that I maintain. When I attempt to load my solution that previously worked, I see the following error.

Could not load solution:/users/sepp/svn/myApp/myApp.sln
Load operation failed.

My solution file has not changed for 4 months.
The project paths within the solution seem to be correct: “iOSmyApp.iOS.csproj”, “DroidmyApp.Droid.csproj”, and “myAppmyApp.csproj”. They haven’t changed in several years.

How do I debug this?
How do I find more information about what is happening? Is there a log file? If so where?
Is there a way to comment out sections of the solutions file to see what section is causing the failure?