error CS0535 in scripts photon

i want to make a multiplayer game by using photon so when i add a script in my camera a compiler error is shown the erro is Assets\Photon\PhotonChat\Demos\DemoChat\IgnoreUiRaycastWhenInactive.cs(4,59): error CS0535: 'IgnoreUiRaycastWhenInactive' does not implement interface member 'ICanvasRaycastFilter.IsRaycastLocationValid(Vector2, Camera)'

i don't know how i can resolve this problem

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