Error in tool_offsetview.py

    def select(self, x_view, y_view):         if self.canon is None: return         pmatrix = glGetDoublev(GL_PROJECTION_MATRIX)         glMatrixMode(GL_PROJECTION)         glPushMatrix()         glLoadIdentity()         vport = glGetIntegerv(GL_VIEWPORT)         gluPickMatrix(x_view, vport[3]-y_view, 5, 5, vport)         glMultMatrixd(pmatrix)         glMatrixMode(GL_MODELVIEW)         glSelectBuffer(self.select_buffer_size)         glRenderMode(GL_SELECT)         glInitNames()         glPushName(0)         if self.get_show_rapids():             glCallList(self.dlist('select_rapids', gen=self.make_selection_list))         glCallList(self.dlist('select_norapids', gen=self.make_selection_list))                  try:             buffer = glRenderMode(GL_RENDER)         except Exception as e:             print(e)             buffer = []         if buffer:             print('buffer')             min_depth, max_depth, names = (buffer[0].near, buffer[0].far, buffer[0].names)             for point in buffer:                 if min_depth < point.near:                     min_depth, max_depth, names = (point.near, point.far, point.names)             self.set_highlight_line(names[0])         else:             print('No buffer')             self.set_highlight_line(None)         glMatrixMode(GL_PROJECTION)         glPopMatrix()         glMatrixMode(GL_MODELVIEW)

    def select_fire(self):         if self.inhibit_selection: return         if STATUS.is_auto_running(): return         if not self.select_primed: return         x, y = self.select_primed         self.select_primed = None         self.makeCurrent()         self.select(x, y)