• Please check your device have enough storage left.
• Make sure your app is the latest version.
• Restart your app.
• Restart your device.
• Reinstall your app.（※）

※If you reinstall the app and log in, go to the web service first and select "Change the Device→Model Change Only". Then remove the SKIYAKI ID from the device.
After removed SKIYAKI ID from the device with the process above, you can log into the account again.