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FileNotFoundException: Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces, Version=1.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified
You are missing a project reference as the error says.
You should add a reference with the following steps:
Right click you project.
Then Manage NuGet Packages...
Manage NuGet Packages...
Microsoft.Bcl.AsyncInterfaces
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