Not sure if this is a processing issue, or that nzb.su has changed something on their end and are sending bad formed xml
[Error] FetchFeedService: An error occurred while processing feed. https://nzb.su/api?t=tvsearch&cat=5030,5040&extended=1&apikey=<removed_apikey>&limit=100&rid=25591&season=4&ep=23
System.Xml.XmlException: The ‘META’ start tag on line 2 position 2 does not match the endtag of ‘HEAD’. Line 3, position 3.
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.Throw(String res, String[] args)
at System.Xml.XmlTextReaderImpl.ThrowTagMismatch(NodeData startTag)
at System.Xml.XmlTextReaderImpl.ParseEndElement()
at System.Xml.XmlTextReaderImpl.ParseElementContent()
at System.Xml.XmlTextReaderImpl.Read()
at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r)
at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r, LoadOptions o)
at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options)
at System.Xml.Linq.XDocument.Parse(String text, LoadOptions options)
at NzbDrone.Core.Indexers.Newznab.NewznabPreProcessor.Process(String source, String url) in m:\BuildAgent1\work\328d72309b633a8\src\zbDrone.Core\Indexers\ewznab\ewznabPreProcessor.cs:line 12
at NzbDrone.Core.Indexers.Newznab.NewznabParser.PreProcess(String source, String url) in m:\BuildAgent1\work\328d72309b633a8\src\zbDrone.Core\Indexers\ewznab\ewznabParser.cs:line 76
at NzbDrone.Core.Indexers.RssParserBase.Process(String xml, String url) in m:\BuildAgent1\work\328d72309b633a8\src\zbDrone.Core\Indexers\RssParserBase.cs:line 32
at NzbDrone.Core.Indexers.Newznab.NewznabParser.Process(String xml, String url) in m:\BuildAgent1\work\328d72309b633a8\src\zbDrone.Core\Indexers\ewznab\ewznabParser.cs:line 39
at NzbDrone.Core.Indexers.FetchFeedService.Fetch(IIndexer indexer, IEnumerable`1 urls) in m:\BuildAgent1\work\328d72309b633a8\src\zbDrone.Core\Indexers\IndexerFetchService.cs:line 123