I have upgraded the Jenkins 2.440.1 version after that not able generate pipeline scripts using snippet generator and it is not showing any error.
Also if i click ADD for credentials it showing 414 URI too long.
Those types of failures might be caused by an incorrect configuration of a reverse proxy. If you’re not using a reverse proxy, then you might check that your plugins are up to date. If it is not either of those, then you will probably need to share more information about your configuration in hopes that others can identify what might have changed.