Hallo, working with simulator and testing with the device sometimes appear this message configuration data could not be found. What can I do? Thanks again for your help guido

Lots of things can cause this, depending on how you have configured the app, the screen, the data. The app itself needs to download data if it's not already in the cache (refresh button on home screen erased the cache). Some screens also need to download data if data for that screen has not already been downloaded. There are a multitude of options in the control panel to control this. Example: You could setup an app that didn't require online data. So, depending on the situation, the message could have different meanings. Clear the cache (click refresh), see what happens? If it still gives this error you have something set-up incorrectly in your control panel for the app (Core settings) or a screen (advanced screen properties for the screen with the trouble)

Help help, I can't find the error. Lot of data lost? I hope no! I have chenged only the colour in Deafault.png image, now I have changed again to the original .png and the message is still present, is impossible to start the app in simulator. Please help Thanks guido

Solved: I don't know how but now is running.

Not sure what the Default.png image has anything to do with data? Glad you got it running... not sure what you're fighting with though. Like I mentioned earlier, we'll get it easier to understand (erros) as time goes on. Glad you're going again.