Error:(35, 61) 错误: 不兼容的类型: EMCallSurfaceView无法转换为EMLocalSurfaceView

protected EMCallSurfaceView localSurface; 
protected EMCallSurfaceView oppositeSurface;
 
 

EMClient.getInstance().callManager().setSurfaceView(localSurface, oppositeSurface);
 
写的时候没问题，编译却提示我
 
Error:(35, 61) 错误: 不兼容的类型: EMCallSurfaceView无法转换为EMLocalSurfaceView
 
求教