MvcServiceCollectionExtensions exception about razorlight

[toddams]

Try to clean your project and rebuild

[MarcAir]

Thanks @toddams, that was the first thing I tried - I do feel there is probably nothing amiss with your package, but rather with my library setup.

can I run it with netcoreapp 1.0.3 and framework 1.1.1?
(to be honest, I don't know if the packages get up/downgraded by mixing the libraries, its just that this was the only way I could migrate my project before from json to msbuild.)

edit:
I'm noticing that there is a dependency downgrade

Detected package downgrade: Microsoft.Extensions.DependencyInjection from 1.2.0-preview1-24168 to 1.2.0-preview1-24163 
 air (>= 1.0.0) -> Microsoft.AspNetCore.Server.Kestrel (>= 1.2.0-preview1-24168) -> Microsoft.AspNetCore.Hosting (>= 1.2.0-preview1-24168) -> Microsoft.Extensions.DependencyInjection (>= 1.2.0-preview1-24168) 
 air (>= 1.0.0) -> Microsoft.Extensions.DependencyInjection (>= 1.2.0-preview1-24163)	

[MarcAir]

Update:
there was an issue with the websockets preview version that I reverted back to 1.0.1 -
here is the fix I found on stack

[igor-bere]

I'm having the same issue with 1.1.0 and ASP.NET Core 2.0 (I cannot use 2.0.0 alpha for different reason).
Tried cleaning and rebuilding project (and adding PreserveCompilationContext beforehand) - no luck.
All nuget packages we use have "stable" versions.
I also tried installing Microsoft.AspNetCore.WebSockets 2.0.0 - nothing changed.