Unable to open map - An error occurred opening the map. Parameter hostname must not be null.

Question

I got the following error with one of my Web Map. “Unable to open map”  An error occurred opening the map.  Parameter Hostname must not be null.

The Web Map opens in AGOL, it is with the features layers, Survey123  Form and Aerial Imagery and other Web Maps with same hosted features layers can be opened in Collector.

Collector version  20.2.2, device Samsung A30

Screenshot_20210126-130327_Collector.jpg

MonumentsTablePic.png

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shresthasamir · Answer

Hello! I tried removing the layers to find out and added them back again and, it did work. Could not find the layer which layer was an issue. As I was hoping one of the layers may have issue mentioned. Thanks for answering my question.

RoyMiller · Answer

Hello!  I was wondering if you've tried ArcGIS Field Maps which is the successor to ArcGIS Collector.  If you are still having issues with that, there could be a layer that is causing issues.  Removing it one by one might tell you which layer is causing the issue.