well in https://mdbootstrap.com/plugins/jquery/vector-map/
some js file is not loaded 404 error .Console log :

Failed to load resource: the server responded with a status of 404 (Not Found)
cn_mill.js:1 Failed to load resource: the server responded with a status of 404 (Not Found)
world_mill.js:1 Failed to load resource: the server responded with a status of 404 (Not Found)
cn_mill.js:1 Failed to load resource: the server responded with a status of 404 (Not Found)
us_lcc.js:1 Failed to load resource: the server responded with a status of 404 (Not Found)
compiled.0.min.js?ver=4.5.15:1 Uncaught Error: Attempt to use map which was not loaded: world_mill
at new jvm.WorldMap (mdbVectorMap.min.js:1)
at w.fn.init.$.fn.vectorMap (mdbVectorMap.min.js:1)
at HTMLDocument.<anonymous> ((index):1760)
at c (compiled.0.min.js?ver=4.5.15:1)
at u (compiled.0.min.js?ver=4.5.15:1)