cash app error may occur due to various reasons like wrong login, login from multiple device etc, so if face any kind of cash app error you can contact customer support. As we know now a days there are many trading apps to invest your money. You can also try some other app like Robinhood it is safe and secure. If you want to know how to invest in Robinhood and How to withdraw money from robinhood, as many of us do not know about it clearly.