I'm using Trados Studio 2024 18.0.1.2259. 

When I open any TM, right-click it to select Settings, click Language Resources, click Segmentation Rules, and then click Edit on any of the default segmentation rules, I get the following error:

This not only happens to all my existing TMs, but also the newly created ones. 

Here is the Error Report:

<SDLErrorDetails time="11/27/2024 8:10:18 PM">
  <ErrorMessage>Value cannot be null.
Parameter name: item</ErrorMessage>
  <Exception>
    <Type>System.ArgumentNullException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <ParamName>item</ParamName>
    <HelpLink />
    <Source>System.Windows.Forms</Source>
    <HResult>-2147467261</HResult>
    <StackTrace><![CDATA[   at System.Windows.Forms.ComboBox.ObjectCollection.AddInternal(Object item)
   at System.Windows.Forms.ComboBox.ObjectCollection.Add(Object item)
   at Sdl.TranslationStudio.TranslationMemoryManager.SegmentationRules.Controls.BasicRuleEditorControl.AddOptionsToComboBoxes()
   at Sdl.TranslationStudio.TranslationMemoryManager.SegmentationRules.Controls.BasicRuleEditorControl..ctor()
   at Sdl.TranslationStudio.TranslationMemoryManager.SegmentationRules.Controls.EditRuleControl.SetupRuleEditors()
   at Sdl.TranslationStudio.TranslationMemoryManager.SegmentationRules.Controls.EditRuleControl..ctor()
   at Sdl.TranslationStudio.TranslationMemoryManager.SegmentationRules.EditRuleDialog.InitializeComponent()
   at Sdl.TranslationStudio.TranslationMemoryManager.SegmentationRules.EditRuleDialog..ctor(CultureInfo languageCulture, Boolean addRule)
   at Sdl.TranslationStudio.TranslationMemoryManager.SegmentationRules.Controls.EditRulesControl.EditSelectedSegmentationRule()
   at Sdl.TranslationStudio.TranslationMemoryManager.SegmentationRules.Controls.EditRulesControl._sentenceRuleEditButton_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>Trados Studio</ProductName>
    <ProductVersion>Studio18</ProductVersion>
    <EntryAssemblyFileVersion>18.0.1.2259</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 11 Enterprise</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1033</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>xxxxxx</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>xxxxxx</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>32324024 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>