My website seems to be running normal, but in the event-log I get an enormous amount of identical errors. The message doesn't not give me single clue where to look at for troubleshooting. Can somebody help me in what direction I should look? Other websites in the same portal are running without problems.

Thanks in advance!

AssemblyVersion: 5.6.3
PortalID: 0
PortalName: ***** Website
UserID: 8
UserName: *****
ActiveTabID: 54
ActiveTabName: Log Viewer
RawURL: /dnn/nl-nl/admin/logviewer.aspx
AbsoluteURL: /DNN/Default.aspx
AbsoluteURLReferrer: ********
UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Trident/4.0; SLCC1; .NET CLR 2.0.50727; InfoPath.2; .NET CLR 1.1.4322; .NET CLR 3.5.21022; .NET CLR 3.5.30729; .NET CLR 3.0.30618; .NET4.0C; .NET4.0E)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 135a9e7a-82ca-452c-bf83-b478637c45c8
InnerException: The 'value' start tag on line 124 does not match the end tag of 'data'. Line 125, position 5.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Xml.XmlTextReaderImpl.Throw
StackTrace:
Message: System.Xml.XmlException: The 'value' start tag on line 124 does not match the end tag of 'data'. Line 125, position 5. 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.XPath.XPathDocument.LoadFromReader(XmlReader reader, XmlSpace space) at System.Xml.XPath.XPathDocument..ctor(String uri, XmlSpace space) at System.Xml.XPath.XPathDocument..ctor(String uri) at DotNetNuke.Services.Localization.Localization.GetResourceFileCallBack(CacheItemArgs cacheItemArgs) at DotNetNuke.Common.Utilities.DataCache.GetCachedDataFromDictionary(CacheItemArgs cacheItemArgs, CacheItemExpiredCallback cacheItemExpired)