Compiled mono missing default .NET libraries – System.Object is not defined or imported
If there is a warning similar to: /lib/mono/4.5/Microsoft.Common.targets: warning : Unable to find framework corresponding to the target framework moniker ‘.NETFramework,Version=v2.0’. Framework assembly references will be resolved from the GAC, which might not be the intended behavior. You can override the .NET Framework on the command line: xbuild /p:TargetFrameworkVersion=”v4.0″ You can change your solution: <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>