plot3d fail, win32 error 1114

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Hi, This is the first time that I try to use plot3d function , It showed information as below: Please give me some advice to fix the problem

sage: x, y = var('x,y') sage: plot3d(x^2 + y^2, (x,-2,2), (y,-2,2))

  0 [main] python2.7 1456 child_info_fork::abort: unable to map C:\Program Files\SageMath 8.1\runtime\opt\sagemath-8.1\local\lib\python2.7\site-packages\psutil\_psutil_cygwin.dll, Win32 error 1114

Graphics3d Object