1. Wrong signature parameter.

2.2.key's problem

3. There are too many customers handling business at the same time, and the system is unstable.

4. In the process of handling business, the page has not been operated for too long, which leads to the expiration of the page.

5. Bank KBao certification is not appropriate.

Solution:

1. Verify with the official verification tool.

2. Change the key.

You can wait for a while.

4. Refresh the page.

5. Log out and log back in.