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Error message when try open Bizagi studio

When i try open bizagi studio, i get this error:

Root element is missing.

Details:

System.ApplicationException: Error in loading preferences file. ---> System.Xml.XmlException: Root element is missing.

at System.Xml.XmlTextReaderImpl.Throw(Exception e)

at System.Xml.XmlTextReaderImpl.ParseDocumentContent()

at System.Xml.XmlReader.MoveToContent()

at System.Data.DataSet.ReadXml(XmlReader reader, Boolean denyResolving)

at System.Data.DataSet.ReadXml(XmlReader reader, XmlReadMode mode, Boolean denyResolving)

at System.Data.DataSet.ReadXml(String fileName, XmlReadMode mode)

at BizAgiStudio.Plugin.CPreferences.LoadPreferencesDataSet()

--- End of inner exception stack trace ---

at BizAgiStudio.Plugin.CPreferences.LoadPreferencesDataSet()

at BizAgiStudio.Plugin.CPreferences.LoadPreferences()

at BizAgiStudio.Plugin.CBizAgiStudioAmbient..ctor(Form mainForm, RibbonControl ribbonControl, RibbonBar ribbonBarContext, StyleManager styleManager, UltraStatusBar statusBar)

at BizAgiStudio.FrmMain..ctor()

at BizAgiStudio.Program.Main(String[] Args)

Someone can help me?