Header Builder Fails to Load Momentarily (JS Conflict/Deprecated Code)

Dear Support Team,

I am experiencing a critical issue that prevents me from using the Header Builder feature on my website. When attempting to open the builder, the following error message appears for just a second or two before disappearing, and the builder fails to load correctly:

“The header builder cannot be loaded correctly. Probably, there is some JS conflict with some of the installed plugins or some issue with the header builder script. Check your JS console to debug this. Try to disable all external plugins and be sure that you have the latest version of the theme installed and then check again.”
MY WEBSITE=SMART-SUPPLY.STORE