A. 1. Restart the app: Close Planimeter Pro completely and reopen it to see if that resolves the pasting issue. 2. Clear clipboard: Sometimes, the clipboard may contain data that causes the app to crash. Try copying a different piece of text and then pasting it into the app.

B. 3. Reinstall the app: If the issue persists, uninstall Planimeter Pro and reinstall it from the App Store to ensure you have the latest version.