NZBHydra2: Unable to connect to indexer. Could not open JPA EntityManager for transaction

Sonarr version (exact version): 3.0.10.1567
Mono version (if Sonarr is not running on Windows): N/A
OS: Win10
Debug logs: sonarr.trace.txt | sonarr.debug.txt
Description of issue: I’m using NZBHydra2 with Sonarr and I’m not sure if this is a Sonarr problem or a Hydra problem, but when I attempt to connect with the locally running client, using the settings Hydra auto-set up, I’m getting the error “Unable to connect to indexer. Could not open JPA EntityManager for transaction”

Full traceback of the error:

[v3.0.10.1567] NzbDrone.Core.Indexers.Newznab.NewznabException: Could not open JPA EntityManager for transaction
   at NzbDrone.Core.Indexers.Newznab.NewznabRssParser.CheckError(XDocument xdoc, IndexerResponse indexerResponse) in C:\BuildAgent\work\63739567f01dbcc2\src\NzbDrone.Core\Indexers\Newznab\NewznabRssParser.cs:line 48
   at NzbDrone.Core.Indexers.Newznab.NewznabRssParser.PreProcess(IndexerResponse indexerResponse) in C:\BuildAgent\work\63739567f01dbcc2\src\NzbDrone.Core\Indexers\Newznab\NewznabRssParser.cs:line 55
   at NzbDrone.Core.Indexers.RssParser.ParseResponse(IndexerResponse indexerResponse) in C:\BuildAgent\work\63739567f01dbcc2\src\NzbDrone.Core\Indexers\RssParser.cs:line 55
   at NzbDrone.Core.Indexers.HttpIndexerBase`1.FetchPage(IndexerRequest request, IParseIndexerResponse parser) in C:\BuildAgent\work\63739567f01dbcc2\src\NzbDrone.Core\Indexers\HttpIndexerBase.cs:line 309
   at NzbDrone.Core.Indexers.HttpIndexerBase`1.TestConnection() in C:\BuildAgent\work\63739567f01dbcc2\src\NzbDrone.Core\Indexers\HttpIndexerBase.cs:line 344

Did some further investigation, turns out my NZBHydra was very bugged and corrupted. Started from scratch and everything is working correctly again.

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