This version of Unity is unsupported.
Method group is Obsolete

CommandBuffer.WaitOnGPUFence

Obsolete public void WaitOnGPUFence(GPUFence fence, Rendering.SynchronisationStage stage);

Parameters

fence The GPUFence that the GPU will be instructed to wait upon.
stage On some platforms there is a significant gap between the vertex processing completing and the pixel processing completing for a given draw call. This parameter allows for requested wait to be before the next items vertex or pixel processing begins. Some platforms can not differentiate between the start of vertex and pixel processing, these platforms will wait before the next items vertex processing. If a compute shader dispatch is the next item to be submitted then this parameter is ignored.

Description

This functionality is deprecated, and should no longer be used. Please use CommandBuffer.WaitOnAsyncGraphicsFence.