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java.lang.NullPointerException: null	at com.github.triceo.robozonky.PortfolioOverview.calculate(PortfolioOverview.java:55)	at com.github.triceo.robozonky.Investor.investOnce(Investor.java:162)	at com.github.triceo.robozonky.Investor.invest(Investor.java:194)	at com.github.triceo.robozonky.app.App.invest(App.java:217)	at com.github.triceo.robozonky.app.App.main(App.java:146)