1. The CA certificate file did not exist.
2. The CA certificate file had been imported.
3. The number of imported CA certificate files exceeded the upper limit.
1. If the CA certificate file did not exist, import the correct CRL file.
2. If the CA certificate file had been imported, no action is required.
3. If the number of imported CA certificate files exceeded the upper limit, delete unnecessary CA certificate files to provide sufficient space for the CA certificate files to be imported.