I've moved this thread to Script Support. Please be sure to post your threads in the correct forum next time. Thank you.
Scripts is for presenting scripts you wrote yourself.
Such an error can only happen if either the default scripts were damaged/modified or if you tried (and failed) to install a script correctly.
If you tried to install a script, please follow the link "how to use a script" in my signature to learn where you might have made a mistake.
If you haven't installed scripts and suspect the engine scripts were damaged (for example by a windows crash), then make a new project and copy the script file from its data folder into your project, that will delete all script additions or modifications and force the scripts back to default.