maybe

1. The serial number was entered incorrectly when applying for a permit, and the certificate applied for by someone else's serial number cannot be used by himself.

2. Software with high authority is installed, and you need to open the visa-free patch to install it.

3. The software has been signed by others and needs to be signed freely.

Qingcheng Police Signal Application Process:

Step 1: scan the code to enter the entrance of the "Qingcheng Police Code" page;

Step 2: Fill in the name, ID number, transportation, address of departure place, local address, health status and other relevant information as required;

Step 3: Upload my photo, click Submit, and complete the Qingcheng Police Application.