Multiple reasons trigger the problem and mostly they are related to network issues. If no airprint printers found appear on your device then firstly click ok over the alert notification and take these steps to resolve the problem. Firstly, verify that the Airplane Mode settings are off on your device and ensure that the wireless signals are not emitted from your device. The next step is to confirm that your printer is properly connected to the network. For that, you may restart your printer and try to re-establish the connection with the network. Additionally, make sure that your printer and the device connected to the same wireless network. If still, the error exists then you must contact the support team and get their advice on eliminating the problem.