diff --git a/core/Registration.java b/core/Registration.java
index 95d817905..6737cac99 100644
--- a/core/Registration.java
+++ b/core/Registration.java
@@ -218,12 +218,17 @@ public class Registration
 		{
 			try
 			{
-				Field f = materialClass.getField( "material" + mat.name() );
-				ItemStackSrc is = ((ItemMultiMaterial) materialItem.item()).createMaterial( mat );
-				if ( is != null )
-					f.set( materials, new DamagedItemDefinition( is ) );
+				if ( mat == MaterialType.InvalidType )
+					((ItemMultiMaterial) materialItem.item()).createMaterial( mat );
 				else
-					f.set( materials, new NullItemDefinition() );
+				{
+					Field f = materialClass.getField( "material" + mat.name() );
+					ItemStackSrc is = ((ItemMultiMaterial) materialItem.item()).createMaterial( mat );
+					if ( is != null )
+						f.set( materials, new DamagedItemDefinition( is ) );
+					else
+						f.set( materials, new NullItemDefinition() );
+				}
 			}
 			catch (Throwable err)
 			{
@@ -239,30 +244,35 @@ public class Registration
 		{
 			try
 			{
-				Field f = partClass.getField( "part" + type.name() );
-				Enum varients[] = type.getVarients();
-				if ( varients == null )
-				{
-					ItemStackSrc is = ((ItemMultiPart) partItem.item()).createPart( type, null );
-					if ( is != null )
-						f.set( parts, new DamagedItemDefinition( is ) );
-					else
-						f.set( parts, new NullItemDefinition() );
-				}
+				if ( type == PartType.InvalidType )
+					((ItemMultiPart) partItem.item()).createPart( type, null );
 				else
 				{
-					if ( varients[0] instanceof AEColor )
+					Field f = partClass.getField( "part" + type.name() );
+					Enum varients[] = type.getVarients();
+					if ( varients == null )
 					{
-						ColoredItemDefinition def = new ColoredItemDefinition();
-
-						for (Enum v : varients)
+						ItemStackSrc is = ((ItemMultiPart) partItem.item()).createPart( type, null );
+						if ( is != null )
+							f.set( parts, new DamagedItemDefinition( is ) );
+						else
+							f.set( parts, new NullItemDefinition() );
+					}
+					else
+					{
+						if ( varients[0] instanceof AEColor )
 						{
-							ItemStackSrc is = ((ItemMultiPart) partItem.item()).createPart( type, v );
-							if ( is != null )
-								def.add( (AEColor) v, is );
-						}
+							ColoredItemDefinition def = new ColoredItemDefinition();
 
-						f.set( parts, def );
+							for (Enum v : varients)
+							{
+								ItemStackSrc is = ((ItemMultiPart) partItem.item()).createPart( type, v );
+								if ( is != null )
+									def.add( (AEColor) v, is );
+							}
+
+							f.set( parts, def );
+						}
 					}
 				}
 			}
diff --git a/core/api/ApiPart.java b/core/api/ApiPart.java
index a40740268..25db2945f 100644
--- a/core/api/ApiPart.java
+++ b/core/api/ApiPart.java
@@ -97,13 +97,20 @@ public class ApiPart implements IPartHelper
 
 	public ClassNode getReader(String name) throws IOException
 	{
-		ClassReader cr;
-		String path = "/" + name.replace( ".", "/" ) + ".class";
-		InputStream is = getClass().getResourceAsStream( path );
-		cr = new ClassReader( is );
-		ClassNode cn = new ClassNode();
-		cr.accept( cn, ClassReader.EXPAND_FRAMES );
-		return cn;
+		try
+		{
+			ClassReader cr;
+			String path = "/" + name.replace( ".", "/" ) + ".class";
+			InputStream is = getClass().getResourceAsStream( path );
+			cr = new ClassReader( is );
+			ClassNode cn = new ClassNode();
+			cr.accept( cn, ClassReader.EXPAND_FRAMES );
+			return cn;
+		}
+		catch (Throwable t)
+		{
+			throw new RuntimeException( "Error loading " + name, t );
+		}
 	}
 
 	public Class getCombinedInstance(String base)
@@ -167,6 +174,7 @@ public class ApiPart implements IPartHelper
 			}
 			catch (Throwable t)
 			{
+				AELog.warning( "Error loading " + name );
 				AELog.error( t );
 				// throw new RuntimeException( t );
 			}
diff --git a/integration/modules/BC.java b/integration/modules/BC.java
index 020079bd6..0e0f9f6c6 100644
--- a/integration/modules/BC.java
+++ b/integration/modules/BC.java
@@ -205,7 +205,7 @@ public class BC extends BaseModule implements IBC
 	@Override
 	public void Init()
 	{
-		AEApi.instance().partHelper().registerNewLayer( "appeng.api.parts.layers.LayerIPipeConnection", "buildcraft.api.transport.IPipeConnection" );
+		AEApi.instance().partHelper().registerNewLayer( "appeng.parts.layers.LayerIPipeConnection", "buildcraft.api.transport.IPipeConnection" );
 		AEApi.instance().registries().externalStorage().addExternalStorageInterface( new BCPipeHandler() );
 
 		Blocks b = AEApi.instance().blocks();
diff --git a/items/materials/ItemMultiMaterial.java b/items/materials/ItemMultiMaterial.java
index dd11c3428..5fe0a45aa 100644
--- a/items/materials/ItemMultiMaterial.java
+++ b/items/materials/ItemMultiMaterial.java
@@ -166,7 +166,7 @@ public class ItemMultiMaterial extends AEBaseItem implements IStorageComponent,
 	{
 		if ( dmgToMaterial.containsKey( is.getItemDamage() ) )
 			return dmgToMaterial.get( is.getItemDamage() );
-		return null;
+		return MaterialType.InvalidType;
 	}
 
 	@Override
diff --git a/items/materials/MaterialType.java b/items/materials/MaterialType.java
index b875c0955..bbbc1c699 100644
--- a/items/materials/MaterialType.java
+++ b/items/materials/MaterialType.java
@@ -17,6 +17,8 @@ import cpw.mods.fml.relauncher.SideOnly;
 
 public enum MaterialType
 {
+	InvalidType(-1, AEFeature.Core),
+
 	CertusQuartzCrystal(0, AEFeature.Core, "crystalCertusQuartz"), CertusQuartzCrystalCharged(1, AEFeature.Core, EntityChargedQuartz.class),
 
 	CertusQuartzDust(2, AEFeature.Core, "dustCertusQuartz"), NetherQuartzDust(3, AEFeature.Core, "dustNetherQuartz"), Flour(4, AEFeature.Flour, "dustWheat"), GoldDust(
diff --git a/items/parts/PartType.java b/items/parts/PartType.java
index c5490fbe1..46ffa0456 100644
--- a/items/parts/PartType.java
+++ b/items/parts/PartType.java
@@ -43,6 +43,8 @@ import appeng.parts.reporting.PartTerminal;
 
 public enum PartType
 {
+	InvalidType(-1, AEFeature.Core, null),
+
 	CableGlass(0, AEFeature.Core, PartCableGlass.class),
 
 	CableCovered(20, AEFeature.Core, PartCableCovered.class),