Duplicate type with name 'Dynamics.Ax.application.' in assembly 'Dynamics.Ax.application,

To resolve this issue perform the following steps:

1. Full compile AX
2. Stop the AOS
3. Truncate the SysXPPAssembly table in SQL (the table is used to contain the assemblies and to share between multiple AOS instances)
4. Delete the DLL and netmodule files in your AOS's bin\xppIL directory(C:\Program Files\Microsoft Dynamics AX\60\Server\MicrosoftDynamicsAX\bin\XppIL directory).
5. Restart the AOS
6. Perform full CIL generation