Writing this into browser:
https://hostname.local:3344/webappviewer/?config=configs/config.json
I get this error:
init.js:115 TypeError: Cannot read property 'itemId' of undefined
at Object._show2DWebMap (MapManager.js?wab_dv=2.15:277)
at Object._showMap (MapManager.js?wab_dv=2.15:93)
at Object.showMap (MapManager.js?wab_dv=2.15:78)
at Object._loadMap (LayoutManager.js?wab_dv=2.15:150)
at Object.<anonymous> (LayoutManager.js?wab_dv=2.15:108)
at init.js:64
at m (init.js:108)
at e.then.b.then (init.js:111)
at Object.<anonymous> (LayoutManager.js?wab_dv=2.15:104)
at init.js:64 "TypeError: Cannot read property 'itemId' of undefined
at Object._show2DWebMap (https://hostname.local:3344/webappviewer/jimu.js/MapManager.js?wab_dv=2.15:277:46)
at Object._showMap (https://hostname.local:3344/webappviewer/jimu.js/MapManager.js?wab_dv=2.15:93:18)
at Object.showMap (https://hostname.local:3344/webappviewer/jimu.js/MapManager.js?wab_dv=2.15:78:14)
at Object._loadMap (https://hostname.local:3344/webappviewer/jimu.js/LayoutManager.js?wab_dv=2.15:150:23)
at Object.<anonymous> (https://hostname.local:3344/webappviewer/jimu.js/LayoutManager.js?wab_dv=2.15:108:18)
at https://js.arcgis.com/3.31/init.js:64:337
at m (https://js.arcgis.com/3.31/init.js:108:248)
at e.then.b.then (https://js.arcgis.com/3.31/init.js:111:132)
at Object.<anonymous> (https://hostname.local:3344/webappviewer/jimu.js/LayoutManager.js?wab_dv=2.15:104:12)
at https://js.arcgis.com/3.31/init.js:64:337
----------------------------------------
rejected at a (https://js.arcgis.com/3.31/init.js:109:154)
at m (https://js.arcgis.com/3.31/init.js:108:407)
at e.then.b.then (https://js.arcgis.com/3.31/init.js:111:132)
at Object.<anonymous> (https://hostname.local:3344/webappviewer/jimu.js/LayoutManager.js?wab_dv=2.15:104:12)
at https://js.arcgis.com/3.31/init.js:64:337
at m (https://js.arcgis.com/3.31/init.js:108:248)
at k (https://js.arcgis.com/3.31/init.js:108:174)
at e.resolve (https://js.arcgis.com/3.31/init.js:110:267)
at Object.<anonymous> (https://hostname.local:3344/webappviewer/jimu.js/LayoutManager.js?wab_dv=2.15:132:13)
at https://js.arcgis.com/3.31/init.js:64:337
----------------------------------------
Error
at e.then.b.then (https://js.arcgis.com/3.31/init.js:111:77)
at Object.<anonymous> (https://hostname.local:3344/webappviewer/jimu.js/LayoutManager.js?wab_dv=2.15:104:12)
at https://js.arcgis.com/3.31/init.js:64:337
at m (https://js.arcgis.com/3.31/init.js:108:248)
at k (https://js.arcgis.com/3.31/init.js:108:174)
at e.resolve (https://js.arcgis.com/3.31/init.js:110:267)
at Object.<anonymous> (https://hostname.local:3344/webappviewer/jimu.js/LayoutManager.js?wab_dv=2.15:132:13)
at https://js.arcgis.com/3.31/init.js:64:337
at ja (https://js.arcgis.com/3.31/init.js:28:441)
at https://js.arcgis.com/3.31/init.js:29:186"