I had a functioning web mapping application built in Web AppBuilder for ArcGIS. The basemap widget was not displaying any basemaps for users. I found the following thread, No Basemap Choices in WebAppViewer and went to the settings and then changed the purpose to "Configurable". I could not figure out what code to paste into the configuration parameters section. I changed the purpose back to "Ready to Use" and saved. Now if I try to view the application, i get this error.
If I try to edit using Web AppBulider, the page just stays on the loading screen.
What did I do? and how can I fix it without redoing the entire Web Mapping Application again?
The error complains about an unexpected token. so you must have made a syntax error in your change. Go back and double check your json file for syntax errors.
I went on the Item Details for the Web Mapping Application < Settings < Web Mapping Application through AGOL.
I never put anything in the Configuration Parameters and then just changed back to Ready To Use and saved.