The gallery does not work after downloading the site. Conflict?

Question

JavaScript

Hello connoisseurs! After a full download of a static html site using wget, the lightbox gallery does not work. When you click on the picture, nothing happens, but an enlarged image should pop up. Error in console:

lightbox.js:209 Uncaught TypeError: Cannot read property 'setStyle' of null
    at klass.start (lightbox.js:209)
    at klass.<anonymous> (lightbox.js:194)
    at HTMLDocument.<anonymous> (prototype.js:370)
    at HTMLDocument.responder (prototype.js:5597)
start @ lightbox.js:209
(anonymous) @ lightbox.js:194
(anonymous) @ prototype.js:370
responder @ prototype.js:5597

Tell me how to fix it?