That usually happens when the KangarooSolver file assembly location set is not the same as the one being loaded by Rhino.
This is different if you are using Rhino 6 vs the WIP. For the WIP it is in the location I gave above. For 6, you probably have it somewhere like here:
C:\Users\Daniel\AppData\Roaming\Grasshopper\Libraries
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Many Thanks !. It is working right now. It was a wrong kangaroosolver.dll that I was referancing
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