"Incompatible type 'intptr (Native Int)' on stack cannot be stored to local 0 with type 'byte*' " using native plugin

I am trying to use native code through the commercial version of [alglib][1]. It works fine in the editor but I can not get it to work in the WebPlayer, i keep getting the error "Incompatible type 'intptr (Native Int)' on stack cannot be stored to local 0 with type 'byte*'" and I have no idea what that means. Does anybody have experienced something similar? [1]: http://www.alglib.net/