Rider does not work due to "MsBuild model already detached from protocol" exception

The problem:

JetBrains Rider throws "MsBuild model already detached from protocol - a fatal error in the mono runtime or one of the native libraries" exception if Mono 4.2.x is used. 

 

The solution: 

Update Mono to the latest one (at least 4.6.x).

 

Hints:

  • A path to Mono is specified here "File | Settings | Build, Execution, Deployment | Mono | Mono root folder path:";
  • If you have more than one Mono installed, check that you pointed JetBrains Rider to the correct one in "Mono root folder path" setting;
  • To check, what version is installed, open a terminal and execute: 

    /{Mono root folder path}/bin/mono --version

 

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