The dojo.js.uncompressed.js and ecm.js.uncompressed.js loading is the new behavior of dojo new version in 3.0.12. They are for code debug mainly in browser developer tools for dojo jgz and ecm jgz files. Loading them failed, the function will not be affected. The customization will not be failed by them.
To do debug for the customization, please use ?debug=true in browser URL to load ICN un-compressed js files.
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