.Net compatibility problem using MathNet lib in Unty [Help]

Hi everyone, I'm having an issue about .Net Framework compatibility while using the MathNet library.
I managed to load and use this lib in mono develop without problems except somes warnings wich seams to turn into errors in unity.

Warnings in MonoDevelop

Code (csharp):

1. A reference to the type 'System.Tuple`3' report to be define in 'c:\Windows\Microsoft.Net\Framework\v2.0.50727\mscorlib.dll' but it is not found
2. A reference to the type 'System.Tuple`2' report to be define in 'c:\Windows\Microsoft.Net\Framework\v2.0.50727\mscorlib.dll' but it is not found
3. A reference to the type 'System.Tuple`4' report to be define in 'c:\Windows\Microsoft.Net\Framework\v2.0.50727\mscorlib.dll' but it is not found

Errors in Unity

Code (csharp):

1. Internal compiler error. See the console log for more information. output was:
2. Unhandled Exception: System.TypeLoadException: Could not load type 'System.Reflection.AssemblyVersionAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
3.  
4.   at (wrapper managed-to-native) System.Reflection.Assembly:InternalGetType (System.Reflection.Module,string,bool,bool)
5.  
6.   at System.Reflection.Assembly.GetType (System.String name, Boolean throwOnError, Boolean ignoreCase) [0x00000] in <filename unknown>:0
7.  
8.   at System.Reflection.Assembly.GetType (System.String name) [0x00000] in <filename unknown>:0
9.  
10.   at Mono.CSharp.RootNamespace.GetTypeInAssembly (System.Reflection.Assembly assembly, System.String name) [0x00000] in <filename unknown>:0
11.  
12.   at Mono.CSharp.RootNamespace.LookupTypeReflection (Mono.CSharp.CompilerContext ctx, System.String name, Location loc, Boolean must_be_unique) [0x00000] in <filename unknown>:0
13.  
14.   at Mono.CSharp.GlobalRootNamespace.LookupTypeReflection (Mono.CSharp.CompilerContext ctx, System.String name, Location loc, Boolean must_be_unique) [0x00000] in <filename unknown>:0
15.  
16.   at Mono.CSharp.Namespace.LookupType (Mono.CSharp.CompilerContext ctx, System.String name, Location loc) [0x00000] in <filename unknown>:0
17.  
18.   at Mono.CSharp.Namespace.Lookup (Mono.CSharp.CompilerContext ctx, System.String name, Location loc) [0x00000] in <filename unknown>:0
19.  
20.   at Mono.CSharp.TypeManager.CoreLookupType (Mono.CSharp.CompilerContext ctx, System.String ns_name, System.String name, Kind type_kind, Boolean required) [0x00000] in <filename unknown>:0
21.  
22.   at Mono.CSharp.PredefinedAttribute.Resolve (Boolean canFail) [0x00000] in <filename unknown>:0
23.  
24.   at Mono.CSharp.PredefinedAttributes.Initialize () [0x00000] in <filename unknown>:0
25.  
26.   at Mono.CSharp.TypeManager.InitOptionalCoreTypes (Mono.CSharp.CompilerContext ctx) [0x00000] in <filename unknown>:0
27.  
28.   at Mono.CSharp.Driver.Compile () [0x00000] in <filename unknown>:0
29.  
30.   at Mono.CSharp.Driver.Main (System.String[] args) [0x00000] in <filename unknown>:0

I tried and searched for days but i can't figure how to solve this matter. I'm new in Unity developement so I may have missed something obvious :-(

I'm using Unity 4.3.4f1 and MathNet 2.6.1.30

Does anyone can help me ?