peverify errors in debug build of Prime.exe

Errors.txt

C:\Program Files (x86)\Microsoft Visual Studio 14.0>peverify C:\Development\NuGa
meEngine\Prime\Prime\Prime\bin\Debug\Prime.exe

Microsoft (R) .NET Framework PE Verifier.  Version  4.0.30319.0
Copyright (c) Microsoft Corporation.  All rights reserved.

[IL]: Error: [C:\Development\NuGameEngine\Prime\Prime\Prime\bin\Debug\Prime.exe
: Prime.Observation::observe[a,o,w]][offset 0x00000003] Unable to resolve token.

 [HRESULT 0x8007000B] - An attempt was made to load a program with an incorrect
format.

 [HRESULT 0x8007000B] - An attempt was made to load a program with an incorrect
format.

 [HRESULT 0x8007000B] - An attempt was made to load a program with an incorrect
format.

 [HRESULT 0x8007000B] - An attempt was made to load a program with an incorrect
format.

[IL]: Error: [C:\Development\NuGameEngine\Prime\Prime\Prime\bin\Debug\Prime.exe
: Prime.Observation+subscribe@40-2[b,a,w,o]::Invoke][offset 0x00000072] Unable t
o resolve token.
 [HRESULT 0x8007000B] - An attempt was made to load a program with an incorrect
format.

 [HRESULT 0x8007000B] - An attempt was made to load a program with an incorrect
format.

 [HRESULT 0x8007000B] - An attempt was made to load a program with an incorrect
format.

 [HRESULT 0x8007000B] - An attempt was made to load a program with an incorrect
format.

[IL]: Error: [C:\Development\NuGameEngine\Prime\Prime\Prime\bin\Debug\Prime.exe
: Prime.Observation+subscribe@69-3[b,a,w,o]::Invoke][offset 0x00000069] Unable t
o resolve token.
11 Error(s) Verifying C:\Development\NuGameEngine\Prime\Prime\Prime\bin\Debug\Pr
ime.exe