Overnight, I've discovered in a particular canvas app, that has been functioning fine, that an error is showing for EVERY data field control in every gallery template. (These are all TEXT or TEXTINPUT controls.) The specific error in each one is the same: "Name isn't valid. "[DATA FIELD NAME]" isn't recognized." There are dozens of these controls, and EVERY one has this error.
And yet, the app is working fine. All of these data fields are showing their data propery. The app is running normally.
I've checked the data source, which is connected as before. (I tried refreshing it, to see if that change anything, but it didn't.)
What's going on with this?