Unable to launch MVM server: License Error: Error checking out license

I get the below license error.

'Unable to launch MVM server: License Error: Error checking out license'

Below is the line of code that produces that error.

import matlab.engine
try:
    eng = matlab.engine.start_matlab()
    tf = eng.isprime(37)
    print(tf)
except Exception as ex:
    print(str(ex))
    raise