Reasons for appearing error in published app Could not render widget MyFirstModule.Page.simpleScheduler1

Hi! I created an app, added a widget, and added all that was needed for his work.  Widget from Marker – Version of Studio Pro 9.20 and 9.21 Build an app and receive this message ‘’Could not render widget 'MyFirstModule.Page.simpleScheduler1'’ In the console I see ‘2023-05-01 16:34:38.445ClientCannot read properties of undefined (reading 'endsWith') TypeError: Cannot read properties of undefined (reading 'endsWith') (...)’ What can be the reason?
0 answers