I'm currently developing in WAB v2.15. I'm trying to use JS API v4.14 instead of the default v3.31. I followed the instructions here; however, after changing the apiVersion to 4.14 (either by un-commenting the "apiUrl = 'https://js.arcgis.com/4.14'" line or changing the apiVersion variable to 4.14) within the env.js file I cannot get WAB to load. When inspecting the code, I see I am receiving the following error: "GET https://js.arcgis.com/4.14/esri/XXXXX.js net::ERR_ABORTED 404".
What am I doing wrong?