Cannot "Add Series" or Indexer, Centos 7

I had used Sonarr on a previous OS without any issues. Now having issues on Centos.
The following issue reappears throughout logs: Method not found: ‘System.Net.HttpWebRequest.set_Date’.
Is this related to Mono?

log from Add Series:
--------Component: SpyHookProxy-------------------
System.MissingMethodException: Method not found: ‘System.Net.HttpWebRequest.set_Date’.
at NzbDrone.Common.Http.Dispatchers.ManagedHttpDispatcher.GetResponse (NzbDrone.Common.Http.HttpRequest request, System.Net.CookieContainer cookies) [0x00000] in :0
at NzbDrone.Common.Http.Dispatchers.FallbackHttpDispatcher.GetResponse (NzbDrone.Common.Http.HttpRequest request, System.Net.CookieContainer cookies) [0x00000] in :0
at NzbDrone.Common.Http.HttpClient.Execute (NzbDrone.Common.Http.HttpRequest request) [0x00000] in :0
at NzbDrone.Common.Http.HttpClient.Get (NzbDrone.Common.Http.HttpRequest request) [0x00000] in :0
at NzbDrone.Common.Http.HttpClient.Get[List`1] (NzbDrone.Common.Http.HttpRequest request) [0x00000] in :0
at NzbDrone.Core.MetadataSource.SkyHook.SkyHookProxy.SearchForNewSeries (System.String title) [0x00000] in :0

log from indexer:
--------------Component: Indexer----------------
System.MissingMethodException: Method not found: ‘System.Net.HttpWebRequest.set_Date’.
at NzbDrone.Common.Http.Dispatchers.ManagedHttpDispatcher.GetResponse (NzbDrone.Common.Http.HttpRequest request, System.Net.CookieContainer cookies) [0x00000] in :0
at NzbDrone.Common.Http.Dispatchers.FallbackHttpDispatcher.GetResponse (NzbDrone.Common.Http.HttpRequest request, System.Net.CookieContainer cookies) [0x00000] in :0

Looks similar to an issue when using an unsupported mono version, needs to be 3.10 or higher. Which version are you running?

Yes, I believe I’m using 2.10

I’ll update it and follow up.

Perfect, that worked! Thanks

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