Got Nullpointer error when running retest

I got this error when running retest

java.lang.NullPointerException: null at com.strategyquant.datalib.dataseries.TimeDataSeriesBase.size(Unknown Source) ~[SQDataLib.jar:na] at com.strategyquant.tradinglib.strategy.PreparedChartData.<init>(Unknown Source) ~[SQTradingLib.jar:na] at com.strategyquant.tradinglib.strategy.MarketData.cloneToPrepared(Unknown Source) ~[SQTradingLib.jar:na] at com.strategyquant.tradinglib.engine.TradingSetup.start(Unknown Source) ~[SQTradingLib.jar:na] at com.strategyquant.tradinglib.engine.BacktestEngine.initializeBacktest(Unknown Source) ~[SQTradingLib.jar:na] at com.strategyquant.tradinglib.engine.BacktestEngine.runBacktest(Unknown Source) ~[SQTradingLib.jar:na] at com.strategyquant.tradinglib.backtest.BacktestDataInitializer.prepareDataFor(Unknown Source) ~[SQTradingLib.jar:na] at com.strategyquant.tradinglib.backtest.BacktestDataInitializer.prepareData(Unknown Source) ~[SQTradingLib.jar:na] at com.strategyquant.plugin.Task.impl.Retest.RetestTask.initializeBacktestData(Unknown Source) ~[na:na] at com.strategyquant.plugin.Task.impl.Retest.RetestTask.beforeStart(Unknown Source) ~[na:na] at com.strategyquant.plugin.Task.impl.Retest.RetestTask.start(Unknown Source) ~[na:na] at com.strategyquant.tradinglib.project.SQProject$1.run(Unknown Source) ~[SQTradingLib.jar:na]

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