Error 5001 when I use python multiprocessing module, which calls Matlab functions

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I used python multiprocessing module for multiprocessing a image processs function, in which I started a Matlab engine and call Matlab functions. Then it appeared many pop-ups: Error 5001 - Unable to access services required to run MATLAB.

I tried to start the Matlab engine in main function and passed the engine as parameters to the image function, but then it appeared TypeError: cannot pickle 'weakref.ReferenceType' object.

The rough code is as follows:

def ImageProcess(data):

eng = matlab.engine.start_matlab()

...

return results

if __name__ == '__main__':

pool = multiprocessing.Pool()

results = pool.map(ImageProcess, data)

pool.close()

pool.join()