WAM log error for files with unique path

[christian-rli]

I had a look into the wam-logs for a different issue and saw that there are warnings for files in FredApp that are supposedly there twice. I'm rather sure that I only put them into one location. Maybe the error message is misleading? @nesnoj @henhuy perhaps you know more about this. If not, it's just fyi :)

Found another file with the destination path 'WAM_APP_FRED/foundation/js/app.js'. It will be ignored since only the first encountered file is collected. If this is not what you want, make sure every static file has a unique path.
Found another file with the destination path 'WAM_APP_FRED/geodata/germany.geojson'. It will be ignored since only the first encountered file is collected. If this is not what you want, make sure every static file has a unique path.
Found another file with the destination path 'WAM_APP_FRED/geodata/germany_nuts_1.geojson'. It will be ignored since only the first encountered file is collected. If this is not what you want, make sure every static file has a unique path.
Found another file with the destination path 'WAM_APP_FRED/geodata/germany_nuts_3.geojson'. It will be ignored since only the first encountered file is collected. If this is not what you want, make sure every static file has a unique path.
Found another file with the destination path 'WAM_APP_FRED/clusters/css/MarkerCluster.css'. It will be ignored since only the first encountered file is collected. If this is not what you want, make sure every static file has a unique path.
Found another file with the destination path 'WAM_APP_FRED/clusters/js/leaflet.markercluster-src.js'. It will be ignored since only the first encountered file is collected. If this is not what you want, make sure every static file has a unique path.

[nesnoj]

Yes, I encountered this error but haven't solved it. So I'd be quite happy if someone came up with a solution :)
As @henhuy implemented the static file loading he might knows how to fix it?