Experience Profile not displaying anything

Question

When I load up the experience profile this is what I see:

This is the error immediately when I load the experience profile page. Tried to find other solutions online but found none:

2021-09-29 11:57:02.443 +08:00 [Error] Sitecore.XConnect.Operations.XdbSearchOperation`1[Sitecore.XConnect.Contact]: Newtonsoft.Json.JsonReaderException: Unexpected character encountered while parsing value: <. Path '', line 0, position 0.
   at Newtonsoft.Json.JsonTextReader.ParseValue()
   at Sitecore.Xdb.Collection.Search.Solr.SolrResults.JsonResultsParser.ParseSearchResponse[TSolrResult](JsonTextReader reader)
   at Sitecore.Xdb.Collection.Search.Solr.SolrResults.JsonResultsParser.<ParseSearchResponseWithCursorMark>d__3`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Sitecore.Xdb.Collection.Search.Solr.SolrReader.<ExecuteQuery>d__14`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Sitecore.Xdb.Collection.Search.Solr.SolrReader.<GetSearchResults>d__13`2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Sitecore.Xdb.Collection.Search.Solr.SolrReader.<SearchContacts>d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Sitecore.Xdb.Collection.Repository.<SearchContacts>d__11.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Sitecore.Xdb.Collection.RepositoryCountersDecorator.<SearchContacts>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Sitecore.XConnect.Service.RepositorySearchInvoker.<Execute>d__7.MoveNext()
2021-09-29 11:57:02.455 +08:00 [Error] ["XdbContextLoggingPlugin"] XdbContext Batch Execution Exception
Newtonsoft.Json.JsonReaderException: Unexpected character encountered while parsing value: <. Path '', line 0, position 0.
   at Newtonsoft.Json.JsonTextReader.ParseValue()
   at Sitecore.Xdb.Collection.Search.Solr.SolrResults.JsonResultsParser.ParseSearchResponse[TSolrResult](JsonTextReader reader)
   at Sitecore.Xdb.Collection.Search.Solr.SolrResults.JsonResultsParser.<ParseSearchResponseWithCursorMark>d__3`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Sitecore.Xdb.Collection.Search.Solr.SolrReader.<ExecuteQuery>d__14`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Sitecore.Xdb.Collection.Search.Solr.SolrReader.<GetSearchResults>d__13`2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Sitecore.Xdb.Collection.Search.Solr.SolrReader.<SearchContacts>d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Sitecore.Xdb.Collection.Repository.<SearchContacts>d__11.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Sitecore.Xdb.Collection.RepositoryCountersDecorator.<SearchContacts>d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Sitecore.XConnect.Service.RepositorySearchInvoker.<Execute>d__7.MoveNext()

Answer 1

From the information in your error message, it sounds like you might have a corrupted contact email or name or one that has a special character that the json does not expect.

Depending on how large your list of contacts is, you could review them manually or perhaps export them from list manager. Then perhaps throw the list into a csv to json converter and see if you can find the troublemaker.