URGENT!!! RhinoNest for Grasshopper 0.3 doesn't work please help!

Hello, I recently installed RhinoNest2.5 and RhinoNest for Grasshopper 0.3. RhinoNest2.5 seems to work, but when I try to run grasshopper I get a "grasshopper loading error" and grasshopper opens without rhinonest in sight. can anyone help me? below is the error message and screen print...thank you!

Object: RhinoNestComponent_CheckCurves (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: RhinoNestComponent_CheckCurves (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: RhinoNestComponent_License (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: RhinoNestComponent_License (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: Control_List (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: Control_List (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: RhinoNestComponent_Simple (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: RhinoNestComponent_Simple (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: RhinoNestComponent_Simple2 (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: RhinoNestComponent_Simple2 (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: Control_NestingCriterion (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: Control_NestingCriterion (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: Control_NestingFreedom (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: Control_NestingFreedom (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: Control_ObjectCriterion (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: Control_ObjectCriterion (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: Control_OffsetInOut (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: Control_OffsetInOut (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: Control_Remap (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: Control_Remap (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: Control_RhinoNestObject (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: Control_RhinoNestObject (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: Control_Sheet2Points (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: Control_Sheet2Points (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: RhinoNestComponent_SheetByCurve (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: RhinoNestComponent_SheetByCurve (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: Control_SheetBySize (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: Control_SheetBySize (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: Control_Slice3D (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: Control_Slice3D (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: Control_Text (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: Control_Text (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}

Object: Control_TextByPlane (level 1)
{
  Exception has been thrown by the target of an invocation.
  TargetInvocationException
}

Object: Control_TextByPlane (level 2)
{
  Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
  TypeLoadException
}