Q. When I start the app, it crashes (application closes unexpectedly).

A.
Try the following:
【Method 1】
Quit all applications operating in the background.

　■How to close applications operating in the background
●iOS devices
Double-click the home button (circled in red).
As per the image, use your finger to flick the app icons upwards until all are closed.
●Android devices
Double-click the application selection button (circled in red).
As per the image, use your finger to flick the app icons to the right until all are closed.
【Method 2】
Shut down the device and restart.
【Method 3】
Delete the iReceiver app and re-install.