Fatal error CS1647 on one server but not other

This error reared it’s ugly head one day and we were very perplexed as to why. The code was running just fine on the development server but on production we were receiving CS1647: An expression is too long or complex to compile.

After much digging as to why this might be, it was discovered that the .NET versions on the servers were different, but not dramatically so. The development server was running 4.6.2 while the production server was 4.6.1. A simple update to the .NET version and the error was resolved.

ASP.net 4.6.2 application failing to build

Our Hudson build server was throwing the following warning and then failing to build our code:

warning MSB3644: The reference assemblies for framework “.NETFramework,Version=v4.5.2” were not found. To resolve this, install the SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK or Targeting Pack installed.

Fixing this problem was very simple and just required us installing the following:
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