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Error : ERROR Value cannot be null.

I have Sitecore version 9.1 installed locally using Sitecore instance manager.

Sitecore experience editor getting error value cannot be null. parameter name: source. Any help to resolve this? let me know if you need more details. 

 

 

 

The Log file has below details:

 


Exception: System.Net.WebException
Message: The remote name could not be resolved: 'sitecore_xconnect'
Source: System
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)

 

23388 07:05:42 INFO HttpModule is being initialized
12032 07:05:44 INFO [Path Analyzer](.) Map EnsureAllDeployed started.
12032 07:05:44 INFO [Path Analyzer](.) Map EnsureAllDeployed complete.
34192 07:05:46 ERROR Value cannot be null.
Parameter name: source
Exception: System.ArgumentNullException
Message: Value cannot be null.
Parameter name: source
Source: System.Core
at System.Linq.GroupedEnumerable`3..ctor(IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
at Sitecore.ExperienceEditor.Utils.ItemUtility.GetLockedItemsCount(String userName)
at Sitecore.ExperienceEditor.Utils.ItemUtility.GetLockedItemsCountOfCurrentUser()
at Sitecore.ExperienceEditor.Speak.Ribbon.Requests.MyItems.MyItemsCountRequest.ProcessRequest()
at Sitecore.ExperienceEditor.Speak.Server.Requests.PipelineProcessorRequest`1.Process(RequestArgs requestArgs)

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