Root element is missing. (C:\Users\ken\AppData\Local\ReefMaster_Software\ReefMaster.exe_Url_0ddk5yfprgvpalrbrgiyjtldk0tdc5xq\2.0.33.0\user.config)
System.Xml.XmlException: Root element is missing.
at System.Xml.XmlTextReaderImpl.Throw(Exception e)
at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
at System.Configuration.XmlUtil..ctor(Stream stream, String name, Boolean readToFirstElement, ConfigurationSchemaErrors schemaErrors)
at System.Configuration.BaseConfigurationRecord.InitConfigFromFile()



at System.Configuration.ConfigurationSchemaErrors.ThrowIfErrors(Boolean ignoreLocal)
at System.Configuration.BaseConfigurationRecord.ThrowIfParseErrors(ConfigurationSchemaErrors schemaErrors)
at System.Configuration.Configuration..ctor(String locationSubPath, Type typeConfigHost, Object[] hostInitConfigurationParams)
at System.Configuration.ClientConfigurationHost.OpenExeConfiguration(ConfigurationFileMap fileMap, Boolean isMachine, ConfigurationUserLevel userLevel, String exePath)
at System.Configuration.ConfigurationManager.OpenExeConfigurationImpl(ConfigurationFileMap fileMap, Boolean isMachine, ConfigurationUserLevel userLevel, String exePath, Boolean preLoad)
at -.dje_qCWWVZDY7YS6LYNJDBR8SDKX773_ejd.#=qZ3lPp$OLiFefVG3ri_ICQ3lZ1Pm3IZZYBMVEYpS7vNc=()
at -.dje_qCWWVZDY7YS6LYNJDBR8SDKX773_ejd.#=q4V6RkuvZdWDWjPIm9Hitf6hJ5uGXikj2KXW28Od8hjw=(Object #=qlm1rZOUG64FNW2dFU4A8sg==, StartupEventArgs #=qUfep0uUAAkFdXu9SfqrSlg==)
at System.Windows.Application.OnStartup(StartupEventArgs e)
at System.Windows.Application.<.ctor>b__1_0(Object unused)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at #=qcXQIUmsLa9kiXxohXqn4$ytoaxA4qduvFnmQaJx8LHLrtjWqrGmfW9QofH9WzBY7.Main()

This looks like a corrupted settings file. Removing the existing settings file should fix this problem, but you will lose preferences such as units settings etc.

To remove your settings file, delete (or rename) the file user.config which you can find at the following location:

C:\Users\Matthew\AppData\Local\ReefMaster_Software\ReefMaster.exe_Url_0nnw0de53f2qq33mmhmuoiabklooek4q\2.0.12.0

Note that the directory underneath "Users" will be your own username, and the version number at the end of the path should match the version of Reefmaster that you are currently running. Also be aware that some of those directories are hidden by default.