diff --git a/Bloxstrap/Resources/Strings.Designer.cs b/Bloxstrap/Resources/Strings.Designer.cs
index fb38f4f..547f49a 100644
--- a/Bloxstrap/Resources/Strings.Designer.cs
+++ b/Bloxstrap/Resources/Strings.Designer.cs
@@ -188,7 +188,7 @@ namespace Bloxstrap.Resources {
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to Failed to extract all files.
+        ///   Looks up a localized string similar to Failed to extract files.
         /// </summary>
         public static string Bootstrapper_ExtractionFailed_Title {
             get {
@@ -235,7 +235,7 @@ namespace Bloxstrap.Resources {
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to Failed to apply all modifications.
+        ///   Looks up a localized string similar to Failed to apply modifications.
         /// </summary>
         public static string Bootstrapper_ModificationsFailed_Title {
             get {
@@ -991,6 +991,15 @@ namespace Bloxstrap.Resources {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Failed to preview theme: {0}.
+        /// </summary>
+        public static string CustomTheme_Editor_Errors_PreviewFailed {
+            get {
+                return ResourceManager.GetString("CustomTheme.Editor.Errors.PreviewFailed", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Open Theme Directory.
         /// </summary>
@@ -1218,7 +1227,7 @@ namespace Bloxstrap.Resources {
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to Custom bootstrappers can only have a maximum of {0} elements, got {1}..
+        ///   Looks up a localized string similar to Custom bootstrappers can only have a maximum of {0} elements, got {1}.
         /// </summary>
         public static string CustomTheme_Errors_TooManyElements {
             get {
diff --git a/Bloxstrap/Resources/Strings.resx b/Bloxstrap/Resources/Strings.resx
index e4111a7..33a9d19 100644
--- a/Bloxstrap/Resources/Strings.resx
+++ b/Bloxstrap/Resources/Strings.resx
@@ -1274,13 +1274,13 @@ Please close any applications that may be using Roblox's files, and relaunch.</v
     <value>Roblox no longer supports Windows 7 or 8.1. To continue playing Roblox, please upgrade to Windows 10 or newer.</value>
   </data>
   <data name="Bootstrapper.ExtractionFailed.Title" xml:space="preserve">
-    <value>Failed to extract all files</value>
+    <value>Failed to extract files</value>
   </data>
   <data name="Bootstrapper.ExtractionFailed.Message" xml:space="preserve">
     <value>Some content may be missing. Force a Roblox reinstallation in settings to fix this.</value>
   </data>
   <data name="Bootstrapper.ModificationsFailed.Title" xml:space="preserve">
-    <value>Failed to apply all modifications</value>
+    <value>Failed to apply modifications</value>
   </data>
   <data name="Bootstrapper.ModificationsFailed.Message" xml:space="preserve">
     <value>Not all modifications will be present in the current launch.</value>
@@ -1302,7 +1302,7 @@ Please close any applications that may be using Roblox's files, and relaunch.</v
     <value>Custom dialog has already been initialised</value>
   </data>
   <data name="CustomTheme.Errors.TooManyElements" xml:space="preserve">
-    <value>Custom bootstrappers can only have a maximum of {0} elements, got {1}.</value>
+    <value>Custom bootstrappers can only have a maximum of {0} elements, got {1}</value>
     <comment>{0} and {1} are numbers</comment>
   </data>
   <data name="CustomTheme.Errors.VersionNotSet" xml:space="preserve">
@@ -1496,4 +1496,7 @@ Defaulting to {1}.</value>
   <data name="CustomTheme.Editor.Save.Success.Description" xml:space="preserve">
     <value>Your theme has been saved!</value>
   </data>
+  <data name="CustomTheme.Editor.Errors.PreviewFailed" xml:space="preserve">
+    <value>Failed to preview theme: {0}</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/Bloxstrap/UI/Elements/Bootstrapper/CustomDialog.Elements.cs b/Bloxstrap/UI/Elements/Bootstrapper/CustomDialog.Elements.cs
index 68a61d0..33743c6 100644
--- a/Bloxstrap/UI/Elements/Bootstrapper/CustomDialog.Elements.cs
+++ b/Bloxstrap/UI/Elements/Bootstrapper/CustomDialog.Elements.cs
@@ -416,7 +416,7 @@ namespace Bloxstrap.UI.Elements.Bootstrapper
         private static UIElement HandleXmlElement_BloxstrapCustomBootstrapper_Fake(CustomDialog dialog, XElement xmlElement)
         {
             // this only exists to error out the theme if someone tries to use two BloxstrapCustomBootstrappers
-            throw new Exception($"{xmlElement.Parent!.Name} cannot have a child of {xmlElement.Name}");
+            throw new CustomThemeException("CustomTheme.Errors.ElementInvalidChild", xmlElement.Parent!.Name, xmlElement.Name);
         }
 
         private static DummyFrameworkElement HandleXmlElement_TitleBar(CustomDialog dialog, XElement xmlElement)
diff --git a/Bloxstrap/UI/ViewModels/Editor/BootstrapperEditorWindowViewModel.cs b/Bloxstrap/UI/ViewModels/Editor/BootstrapperEditorWindowViewModel.cs
index b8c1968..72129b8 100644
--- a/Bloxstrap/UI/ViewModels/Editor/BootstrapperEditorWindowViewModel.cs
+++ b/Bloxstrap/UI/ViewModels/Editor/BootstrapperEditorWindowViewModel.cs
@@ -50,7 +50,7 @@ namespace Bloxstrap.UI.ViewModels.Editor
                 App.Logger.WriteLine(LOG_IDENT, "Failed to preview custom theme");
                 App.Logger.WriteException(LOG_IDENT, ex);
 
-                Frontend.ShowMessageBox($"Failed to preview theme: {ex.Message}", MessageBoxImage.Error, MessageBoxButton.OK);
+                Frontend.ShowMessageBox(string.Format(Strings.CustomTheme_Editor_Errors_PreviewFailed, ex.Message), MessageBoxImage.Error, MessageBoxButton.OK);
             }
         }