I was just running a simple Find and Replace function.

Stacktrace here:

<SDLErrorDetails time="12/2/2018 8:32:42 PM">
  <ErrorMessage>Specified argument was out of the range of valid values.
Parameter name: Invalid 'from' position for this document</ErrorMessage>
  <Exception>
    <Type>System.ArgumentOutOfRangeException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <ParamName>Invalid 'from' position for this document</ParamName>
    <HelpLink />
    <Source>Sdl.TranslationStudio.Common</Source>
    <HResult>-2146233086</HResult>
    <StackTrace><![CDATA[   at Sdl.TranslationStudio.Common.SearchFramework.InteractiveFind.UpdateRangeFrom(Position from)
   at Sdl.TranslationStudio.Common.FindAndReplace.FindInDocument.UpdateRangeFrom(ContentRange range)
   at Sdl.TranslationStudio.Common.FindAndReplace.AbstractFindAndReplaceProvider.dialogReplaceInvoked(Object sender, ReplaceEventArgs e)
   at Sdl.TranslationStudio.Common.FindAndReplace.ReplaceControl.replaceButton_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)]]></StackTrace>
  </Exception>
  <Environment>
    <ProductName>SDL Trados Studio</ProductName>
    <ProductVersion>15.0.0.0</ProductVersion>
    <EntryAssemblyFileVersion>15.0.1.36320</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Pro</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1033</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>8378192 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>