1. Signature verification error. Check whether the signature string or signature private key matches the application public key.

2. Error in signature verification. The public key or certificate of the corresponding signature algorithm is not configured in the application.

3. Error in signature verification. The symbol value is inconsistent with the signature type specified by the signtype parameter.

4. Error in signature verification. Ensure that the character set parameters are placed in the URL query string, and each parameter value is encoded by the character set indicated by the character set parameter.