We could not complete your App Store request. An unknown error occured (100).
Are you struggling with the app store unknown error message (100)? This unknown error message is usually occurred when trying to download or purchase an application from the app store or iTunes store. If you are keep getting this error message on your apple product such as iPhone or iPad or iPod or Macbook, Try these two instructions below. Hope this helps you to resolve the unknown error message issue.
First Way – Sign Out & Re-Sign In
Step 01. Go to Settings > iTunes & App Store > Tab your App Store ID
Step 02. Sign Out from the App Store and Re-Sign In the App Store. And then try to download application again. (Note. If it’s Macbook?, Try to Sign Out from iTunes and Re-Sign in.) If it’s still not working, Try the Second Way (Hard Resetting).
Second Way – Hard Reset your device
Step 01. Press and hold the Power and Home buttons for 10 – 15 seconds and Wait until the Apple logo appears.
Step 02. If the Apple logo appears on the screen, Release all buttons.
Step 03. Try to download the application that has an error message when downloading.