My first suggestion would be to invite you to upgrade your Developer Studio version.
The capture suggests you’re still in 4.X version, and latest 5.1 version provides many improvements in the workflows (notably a confirmation box when you accidentally delete an app ;))
My second suggestion is that, unless you’re working on Wifi topics, it probably doesn’t matter: wifiWebApp if a sample application, and deleting it doesn’t prevent the framework to work correctly.
Otherwise, in order to fix your immediate problem, you can either reinstall or upgrade the framework on your device to restore all the built-in apps, or erase the user partition in the recovery wizard (same effect: will reinstall the apps / but warning: you will loose any modification you’ve done manually on the device file system)
Dear daav,
Sorry for later update my process.
My IDE is working now.
I fixed the issue by restart my PC and run $ sudo apt-get update…
For now the DS version is v5.1:grin::