ValueError: Unknown code generation target: numpy , should be one of ['auto', 'numpy', 'cython']
and my version of brian2 is 2.4.2, When I run the 'More complex connectivity' in 'Introduction to Brian part 2: Synapses', the problem occur. i didn 't know why? Can you help me? Should I change my version of brian2 to 2.2.1?