Error building Player: Releasing render texture that is set to be RenderTexture.active

1、

I solved this issue  disabling the camera that use rendertexture every time that I need to do some of this actions:

1. When changing any attribute of RenderTexture after isCreated().
2. When changing Screen size or Resolution of the camera where was added a RenderTexture.
3. When changing VSyncCount of QualitySettings.
4. When changing Antialising of QualitySettings.

 2、把R8 改成.ARGB32

　　RenderTexture(shadowmapResolution, shadowmapResolution, 16, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Default);