Error when running run_cgs_model_mallet

[EddieLv]

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Version (please complete the following information):

• Python: [e.g. Python 3.7.4]
• SCENIC+: [e.g. 0.1.dev40+g4ff5053.d20210520]
• If a bug is related to another module [e.g. matplotlib 3.3.9]

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