KerbalEngineer XmlException: Root element is missing Error

[Xtra]

Hello,

Can anyone tell me what this error is about and how to fix it?

[LOG 21:29:50.835] [AddonLoader]: Instantiating addon 'GeneralSettings' from assembly 'KerbalEngineer'
[EXC 21:29:51.035] XmlException: Root element is missing.
    System.Xml.XmlTextReaderImpl.Throw (System.Exception e) (at <1d98d70bb7d8453b80c25aa561fdecd1>:0)
    System.Xml.XmlTextReaderImpl.ThrowWithoutLineInfo (System.String res) (at <1d98d70bb7d8453b80c25aa561fdecd1>:0)
    System.Xml.XmlTextReaderImpl.ParseDocumentContent () (at <1d98d70bb7d8453b80c25aa561fdecd1>:0)
    System.Xml.XmlTextReaderImpl.Read () (at <1d98d70bb7d8453b80c25aa561fdecd1>:0)
    System.Xml.XmlTextReader.Read () (at <1d98d70bb7d8453b80c25aa561fdecd1>:0)
    System.Xml.XmlReader.MoveToContent () (at <1d98d70bb7d8453b80c25aa561fdecd1>:0)
    Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderList1.Read3_ArrayOfSettingItem () (at <21126d8d63964d669d6695d04affcfbb>:0)
    System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <9577ac7a62ef43179789031239ba8798>:0)
    Rethrow as InvalidOperationException: There is an error in XML document (0, 0).
    System.Xml.Serialization.XmlSerializer.Deserialize (System.Xml.XmlReader xmlReader, System.String encodingStyle, System.Xml.Serialization.XmlDeserializationEvents events) (at <1d98d70bb7d8453b80c25aa561fdecd1>:0)
    System.Xml.Serialization.XmlSerializer.Deserialize (System.Xml.XmlReader xmlReader, System.String encodingStyle) (at <1d98d70bb7d8453b80c25aa561fdecd1>:0)
    System.Xml.Serialization.XmlSerializer.Deserialize (System.IO.Stream stream) (at <1d98d70bb7d8453b80c25aa561fdecd1>:0)
    KerbalEngineer.Settings.SettingHandler.Deserialise (System.String fileName, System.Type[] extraTypes) (at <134deb60e87843589b7ea1a020650b28>:0)
    KerbalEngineer.Settings.SettingHandler.Load (System.String fileName, System.Type[] extraTypes) (at <134deb60e87843589b7ea1a020650b28>:0)
    KerbalEngineer.Settings.GeneralSettings.OnEnable () (at <134deb60e87843589b7ea1a020650b28>:0)
    UnityEngine.DebugLogHandler:LogException(Exception, Object)
    ModuleManager.UnityLogHandle.InterceptLogHandler:LogException(Exception, Object)
    UnityEngine.GameObject:AddComponent(Type)
    AddonLoader:StartAddon(LoadedAssembly, Type, KSPAddon, Startup)
    AddonLoader:StartAddons(Startup)
    <LoadObjects>d__90:MoveNext()
    UnityEngine.MonoBehaviour:StartCoroutine(IEnumerator)
    <CreateDatabase>d__71:MoveNext()
    UnityEngine.MonoBehaviour:StartCoroutine(IEnumerator)
    GameDatabase:StartLoad()
    <LoadSystems>d__11:MoveNext()
    UnityEngine.MonoBehaviour:StartCoroutine(IEnumerator)
    LoadingScreen:Start()