getting error with sharepoint version 2019

Currently we have community version 11 integrated with sharepoint 2013 and everything work great.  I am trying to integrate community11 with sharepoint version 2019. I am getting following error. I am trying to debug but nothing hot code yet. something on community is going wrong. There is no error in evet viewer

Thank you for your help!

 

UnknownException: Error while mapping forum reply [ContentId] '35adc521-e99d-497b-be68-6a8ebfee9834'. (Value not found in Messages.xml en-US for: SearchIndexingError) ---> System.NullReferenceException: Object reference not set to an instance of an object.

   at Telligent.Evolution.Api.Content.Search.SearchIndexingFormatter.<>c__DisplayClass2_0.<GetEmbeddedFileNamesAndText>b__0(CentralizedFileSystemUrl cfsUrl)

   at System.Text.RegularExpressions.RegexReplacement.Replace(MatchEvaluator evaluator, Regex regex, String input, Int32 count, Int32 startat)

   at System.Text.RegularExpressions.Regex.Replace(String input, MatchEvaluator evaluator)

   at Telligent.Evolution.Api.Content.Search.SearchIndexingFormatter.GetEmbeddedFileNamesAndText(String text)

   at Telligent.Evolution.Api.Search.SearchIndexDocumentMapper.MapPost(Post post, SearchIndexDocument doc)

   at Telligent.Evolution.Api.Search.SearchIndexDocumentMapper.MapForumReply(Post post)

   --- End of inner exception stack trace ---

   at Telligent.Evolution.Api.Search.SearchIndexDocumentMapper.MapForumReply(Post post)

   at Telligent.Evolution.Forums.Plugins.Content.ForumReplyContentType.GetContentToIndex()