Unhandled Exception

Hey Guys,

I have some DLLs in my project that someone else made. I have the source solutions in Xamarin as well. When I try to rebuild the solution I am running into this error:

I have been googling around and there are many different solutions to this but they basically all come down to this. "You are missing some reference / dll..." So how do I figure out which one I am missing?

Cheers,
Chabala

 

Update: I found out that when it creates the builds in Xamarin it makes the file:
Release/.NETFrameworks,Version=4.0.AssemblyAttribute.cs
with this inside it.
// <autogenerated />
[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETFramework,Version=v4.0", FrameworkDisplayName = "")]
I think this is wrong.. it should be version 3.5 right? Is this what the problem is? How do I fix this on Mac?

I figured this out because Unity also throws the error:
TypeLoadException: Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly '[dll-name]'

 

Update: I have built successfully! I opened the solution in MonoDevelop and built there because it had Mono 2.10.12 set as the default. When I tried to force Xamarin to build in this older version it sent me an error. So that is where I need to focus on getting this to work now.