Duplicate type with name ‘Dynamics.Ax.application.TableName

Hello All,
Recently I faced really a weird issue. I was trying to import a simple project in AX 2012 and it was giving annoying error on import of a table "Duplicate type with name ‘Dynamics.Ax.application.TableName". When I tried to generate CIL it gave me the same error again and CIL couldn't be completed.
Later on it stopped system AIF services too. So I followed below steps to resolve the issue:

1) Stop AOS service.
2) Delete all files on the AOS server under C:\Program Files\Microsoft Dynamics AX\60\Server\<aos instance name>\bin\XppIL
3) Connect to the model db via SQL Management studio
4)Truncate the table SYSXPPASSEMBLY which lists all of the files found in step 2
5) Start AOS service
6) Run Full CIL

and the issue is resolved. Keep Daxing !