Problems of VB software itself. If the version is too low, vb will not be able to load, resulting in a flashback reaction when loading the label control. This is a problem with vb's own software and needs to be updated. Flashback refers to the sudden exit interruption (similar to Windows application crash) when an application is opened or used in mobile devices (such as iOS and Android devices) or non-mobile devices (such as Windows and Linux devices).