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Locking the verrtex buffer

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Hi I was just looking for a bit of help. I'm trying to lock the vertex buffer so I can compute the bounding box for my mesh using the code below:
        BYTE* vertices=NULL;
        mesh->LockVertexBuffer(D3DLOCK_READONLY, (LPVOID*)vertices);

      //bounds of the model
      D3DXVECTOR3 min, //lower left coordinate
                  max; //upper right coordinate

      //Compute a coordinate-axis oriented bounding box
                               &min, &max);


DirectX debug output is telling me: Direct3D9: (ERROR) :Bad parameter passed for ppbData for locking a vertexbuffer Direct3D9: (ERROR) :Unlock failed on a buffer; vertex buffer wasn't locked. Does anybody know what I'm doing wrong? Any help would be very much appreciated.

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