diff --git a/osu.Game.Modes.Osu/Objects/Drawables/DrawableOsuHitObject.cs b/osu.Game.Modes.Osu/Objects/Drawables/DrawableOsuHitObject.cs
index c7cc7cfdd7..1cf2385314 100644
--- a/osu.Game.Modes.Osu/Objects/Drawables/DrawableOsuHitObject.cs
+++ b/osu.Game.Modes.Osu/Objects/Drawables/DrawableOsuHitObject.cs
@@ -2,7 +2,6 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using System.ComponentModel;
-using osu.Game.Modes.Objects;
 using osu.Game.Modes.Objects.Drawables;
 
 namespace osu.Game.Modes.Osu.Objects.Drawables
diff --git a/osu.Game/Online/Chat/Drawables/DrawableChannel.cs b/osu.Game/Online/Chat/Drawables/DrawableChannel.cs
index f5fac3d4c5..eb8653976a 100644
--- a/osu.Game/Online/Chat/Drawables/DrawableChannel.cs
+++ b/osu.Game/Online/Chat/Drawables/DrawableChannel.cs
@@ -7,7 +7,6 @@ using System.Linq;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Primitives;
-using osu.Framework.Threading;
 using osu.Game.Graphics.Sprites;
 
 namespace osu.Game.Online.Chat.Drawables
diff --git a/osu.Game/OsuGame.cs b/osu.Game/OsuGame.cs
index 9f7e3e04dc..5c62b298eb 100644
--- a/osu.Game/OsuGame.cs
+++ b/osu.Game/OsuGame.cs
@@ -13,7 +13,6 @@ using osu.Game.Input;
 using OpenTK.Input;
 using osu.Framework.Logging;
 using osu.Game.Graphics.UserInterface.Volume;
-using osu.Game.Database;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics.Transforms;
 using osu.Framework.Timing;
diff --git a/osu.sln.DotSettings b/osu.sln.DotSettings
index d3054a4561..3b12d41a3d 100644
--- a/osu.sln.DotSettings
+++ b/osu.sln.DotSettings
@@ -15,7 +15,8 @@
 	<s:String x:Key="/Default/CodeInspection/Highlighting/InspectionSeverities/=RedundantCommaInInitializer/@EntryIndexedValue">DO_NOT_SHOW</s:String>
 	<s:String x:Key="/Default/CodeInspection/Highlighting/InspectionSeverities/=RedundantEmptyObjectCreationArgumentList/@EntryIndexedValue"></s:String>
 	<s:Boolean x:Key="/Default/CodeInspection/Highlighting/InspectionSeverities/=RedundantEmptyObjectCreationArgumentList/@EntryIndexRemoved">True</s:Boolean>
-	<s:String x:Key="/Default/CodeInspection/Highlighting/InspectionSeverities/=RedundantUsingDirective/@EntryIndexedValue">DO_NOT_SHOW</s:String>
+	<s:String x:Key="/Default/CodeInspection/Highlighting/InspectionSeverities/=RedundantUsingDirective/@EntryIndexedValue">ERROR</s:String>
+	
 	<s:String x:Key="/Default/CodeInspection/Highlighting/InspectionSeverities/=RedundantVerbatimStringPrefix/@EntryIndexedValue">HINT</s:String>
 	<s:String x:Key="/Default/CodeInspection/Highlighting/InspectionSeverities/=SuggestVarOrType_005FBuiltInTypes/@EntryIndexedValue">DO_NOT_SHOW</s:String>
 	<s:String x:Key="/Default/CodeInspection/Highlighting/InspectionSeverities/=SuggestVarOrType_005FSimpleTypes/@EntryIndexedValue">DO_NOT_SHOW</s:String>