.nuget\packages\microsoft.codeanalysis.analyzers\1.1.0\analyzers\dotnet\cs\Microsoft.CodeAnalysis.CSharp.Analyzers.dll could not be found

This was frustrating and inexplicable (so far)

Asp.net core 2.1 project (that had been upgraded from 1.0) started to fail with:

\.nuget\packages\microsoft.codeanalysis.analyzers\1.1.0\analyzers\dotnet\cs\Microsoft.CodeAnalysis.CSharp.Analyzers.dll 
could not be found

There were online reports about the same problem, but I couldn't understand what they were talking about.

This had occurred completely spontaneously, as far as I could tell.

I searched the code base for any reference to

"Microsoft.CodeAnalysis.CSharp" 

And the only one I found was in the file

"obj\project.assets.json"

Then I went and looked at another project of mine which did not have the same problem.

I found they differed only slightly in this partt of the assets file....

I made them identical. Then the problem went away.

"Microsoft.CodeAnalysis.Analyzers/1.1.0": {
  "sha512": "HS3iRWZKcUw/8eZ/08GXKY2Bn7xNzQPzf8gRPHGSowX7u7XXu9i9YEaBeBNKUXWfI7qjvT2zXtLUvbN0hds8vg==",

The bad one said:

"Microsoft.CodeAnalysis.Analyzers/1.1.0": {
  "sha512": "GM6h8wakaDLlszoxBZoqdDAs98bd0eu0qYjJX4nMEO6p05ZulUM1V5tXtaYRypGhe78bGci02ejvH4SAumYsKA==",

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