How can problems be turned into something good? We develop and test a theoretical model suggesting that error mastery orientation influences whether problems have positive or negative outcomes. We argue that problems increase or decrease entrepreneurial learning and venture progress depending on error mastery orientation. We tested our theoretical model using a longitudinal design with one baseline measurement and 11 weekly measurements. Analyses were based on 1,016 lagged observations from 168 individuals, who engaged in venture creation as part of entrepreneurship training courses. The results suggest that error mastery orientation functions like a switch, turning problems into something good.