1. The QR code is invalid or invalid: the scanned QR code has expired, been cancelled or has problems, and cannot be displayed normally. Please contact the relevant departments or technical support of lanshan district Compulsory Education Admission Service Platform to confirm the validity of the QR code.
2. Device or browser problems: compatibility problems may occur in specific devices or browsers, resulting in the inability to display the QR code. Opening the QR code on different devices or browsers can eliminate this problem.