I'm limited when it comes to coding. I opened the console and errors are present. Hopefully this helps.
/apps/webappviewer/jimu.js/main.js:1364 jimu.js init...
/apps/webappviewer/jimu.js/main.js:11 Load Config: 337.422ms
/apps/webappviewer/jimu.js/main.js:327 Load Map: 509.838ms
/apps/webappviewer/jimu.js/main.js:130 widget [widgets/Search/Widget] created.
/apps/webappviewer/jimu.js/main.js:130 widget [widgets/HomeButton/Widget] created.
/apps/webappviewer/jimu.js/main.js:130 widget [widgets/Scalebar/Widget] created.
/apps/webappviewer/jimu.js/main.js:130 widget [widgets/ZoomSlider/Widget] created.
/apps/webappviewer/jimu.js/main.js:130 widget [widgets/Coordinate/Widget] created.
/apps/webappviewer/jimu.js/main.js:130 widget [themes/LaunchpadTheme/widgets/Header/Widget] created.
/apps/webappviewer/jimu.js/main.js:130 widget [themes/LaunchpadTheme/widgets/AnchorBarController/Widget] created.
/apps/webappviewer/jimu.js/main.js:301 Load widgetOnScreen: 304.699ms
/apps/webappviewer/jimu.js/main.js:130 widget [widgets/Summary/Widget] created.
js.arcgis.com/3.16/init.js:182 Error: Invalid URL.
at Error (native)
at Object.g.load (http://js.arcgis.com/3.16/init.js:1042:343)
at http://js.arcgis.com/3.16/init.js:181:69
at c (http://js.arcgis.com/3.16/init.js:66:221)
at d (http://js.arcgis.com/3.16/init.js:66:10)
at resolve.callback (http://js.arcgis.com/3.16/init.js:67:350)
at c (http://js.arcgis.com/3.16/init.js:66:436)
at d (http://js.arcgis.com/3.16/init.js:66:10)
at resolve.callback (http://js.arcgis.com/3.16/init.js:67:350)
at http://js.arcgis.com/3.16/init.js:185:300y @ js.arcgis.com/3.16/init.js:182
js.arcgis.com/3.16/init.js:182 Error: Invalid URL.(…)y @ js.arcgis.com/3.16/init.js:182
js.arcgis.com/3.16/init.js:182 Error: Invalid URL.(…)y @ js.arcgis.com/3.16/init.js:182
js.arcgis.com/3.16/init.js:182 Error: Invalid URL.(…)y @ js.arcgis.com/3.16/init.js:182
js.arcgis.com/3.16/init.js:182 Error: Invalid URL.(…)y @ js.arcgis.com/3.16/init.js:182
js.arcgis.com/3.16/init.js:182 Error: Invalid URL.(…)