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

When I do Incremental CIL in my AX Client.I got the Below Error because this  Error i won't able to develop SSRS Report related works.

Duplicate type with name 'Dynamics.Ax.application.<My Class Name>' in assembly 'Dynamics.Ax.application,

If anybody known the solution for the above problem pls reply...

Thanks in Advance...