License Manager Error -1 when call python module which includes multiprocessing

The python module I invoked from Matlab uses Pool (multiprocessing) locally. In this case, Matlab always returns License Manager Error -1, the license.dat file cannot be found.

Answer 1

[Alok Nimrani]

Hello Yun Lu,

You are experiencing this error because using the ‘multiprocessing’ Python module from MATLAB is not a supported workflow, as indicated in the following link: http://www.mathworks.com/help/matlab/matlab_external/limitations-to-python-support.html

However, as a workaround, try setting Python executable as the executable to be used by the ‘multiprocessing’ Python module before invoking Python. To do so, try executing the following commands in the MATLAB command window before your call to ‘multiprocessing’ Python module:

>> [v, exe] = pyversion;
>> py.multiprocessing.spawn.set_executable(exe)

Hope this helps.

Thanks