backtest error

During the algorithm initialization, the following exception has occurred: AttributeError : 'MeanVarianceOptimizationPortfolioConstructionModel' object has no attribute 'SetPythonWrapper' at Initialize in main.py:line 40 AttributeError : 'MeanVarianceOptimizationPortfolioConstructionModel' object has no attribute 'SetPythonWrapper'

How do I debug this:?