"Cannot read property '3' of null" WebAppBuilder Custom Widget

[Than_HtetAung]

Hi Guys,

I am getting this error message when it is calling a map service with esriRequest object in webappbuilder widget.

Below is the code snippet

 esriRequest({
    url: this.url,
    content: {
    f: 'json'
 },
    handleAs: 'json'
 }).then(lang.hitch(this, function (response) {
    console.log("successfully call");
 }
 this.emit('details-loaded', response);
 }), lang.hitch(this,function(error){
   console.log("got error");
    console.log(error);
 }));

Below is the error log

TypeError: Cannot read property '3' of null
at new f (https://js.arcgis.com/3.17/init.js:450:489)
at Object.c.urlToObject (https://js.arcgis.com/3.17/init.js:700:111)
at Object.c.getProxyUrl (https://js.arcgis.com/3.17/init.js:701:272)
at u (https://js.arcgis.com/3.17/init.js:859:368)
at e (https://js.arcgis.com/3.17/init.js:864:490)
at z (https://js.arcgis.com/3.17/init.js:871:60)
at Object._getServiceDetails (https://hseqmap.wde.woodside.com.au/map/widgets/HSEQMap/clusterfeaturelayer.js?wab_dv=2.1:241:17)
at Object.constructor (https://hseqmap.wde.woodside.com.au/map/widgets/HSEQMap/clusterfeaturelayer.js?wab_dv=2.1:235:22)
at Object.advice (https://js.arcgis.com/3.17/init.js:119:199)
at Object.c (https://js.arcgis.com/3.17/init.js:118:492)

Currently all the querytask, esrirequest and geometry task are failed to call or filter through map service. 

We are using the esri proxy in the builder also.

Would like to understand when will that error occur and what item map specifically causing this error?

Best Regards,

Than Htet Aung

[Yunpiao_WhitneyBai1]

I have the same problem when I use esri boilerplate template and try to open the index html directly. But in the IDE environment, it works fine. 

Anyone knows to fix it?

Thanks

[Than_HtetAung · Accepted solution]

Hi Yun,

I have fixed it by fixing proxy url in config.json file. Found out there is typo error in url.

==> Object.c.getProxyUrl 

So I will suggest, try to read from error stack and check one level by another.

Most of the time configuration has issue.

Best Regards,

Than