code: def test_multi_y_error(self):
      overlay = Overlay(
          [
              Curve(range(10), label=f"Data {i}").opts(
                  subcoordinate_y=True
              )
              for i in range(2)
          ]
      )
      overlay.opts(multi_y=True)
      with pytest.raises(
          ValueError,
          match="multi_y and subcoordinate_y are not supported together",
      ):
          bokeh_renderer.get_plot(overlay)
  
imports: import numpy
  import pytest
  from bokeh.models.tools import WheelZoomTool, ZoomInTool, ZoomOutTool
  from holoviews.core import Overlay
  from holoviews.element import Curve
  from holoviews.element.annotation import VSpan
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 16 for calling the TestSubcoordinateY obj's underlying member method code with example usage: obj.test_multi_y_error() without return types