Modals, alerts, notifications not showing in browser

All show ok in wappler preview mode but not when open in browser.
Win 10
wappler 3.9.9
Bootstrap 4 local, node.js
Getting unknown component in console
also popper js.map not found,

Checked the layout page has bootstrap/4/js/popper.min.js referenced in body.
Im sure this is simple but can’t see solution…

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