function doesnot match delegate type

The delegate in the code is

private:delegate void UpdateProgressCallback(Int64^Bt,Int64^Tb);

and the function is

private:void UpdateProgress(Int64 Bt,Int64 Tb)

  {

  }

I used the following code 

this->Invoke(gcnew UpdateProgressCallback(&dwmgr::Form1::UpdateProgress),gcnew array <Object^>{Convert::ToInt64( str1->Length),fz+stp}); 

and it gave an error

error C3352: 'void dwmgr::Form1::UpdateProgress(__int64,__int64)' : the specified function does not match the delegate type 'void (System::Int64^,Systen::Int64^)'

here

fz and stp are Int64.

Someone please help me to solve it.