I have recently made a modification to two apps that are accessing SharePoint lists. These have been working well for months. The new versions show as being error free but now fail when writing to the Sharepoint list.
When I run the apps (either in Play or within the Editor) they fail on the SubmitForm with the error message:
"There was a problem saving your changes. The data source may be invalid".
If I am running it within the Editor then when I exit from "Play" mode the button with the SubmitForm now shows with the error symbol and displays this message:
Can anyone help me to understand what is causing this error?
Thanks