Fix an ObjectHolderRef internal error message (#5214)

src/main/java/net/minecraftforge/registries/ObjectHolderRef.java

@@ -92,7 +92,7 @@ public class ObjectHolderRef implements Consumer<Predicate<ResourceLocation>>
 
         if (this.injectedObject == null || !isValid())
         {
-            throw new IllegalStateException(String.format("The ObjectHolder annotation cannot apply to a field that does not map to a registry. Ensure the registry was created during the RegistryEvent.NewRegistry event. (found : %s at %s.%s)", field.getType().getName(), field.getClass().getName(), field.getName()));
+            throw new IllegalStateException(String.format("The ObjectHolder annotation cannot apply to a field that does not map to a registry. Ensure the registry was created during the RegistryEvent.NewRegistry event. (found : %s at %s.%s)", field.getType().getName(), field.getDeclaringClass().getName(), field.getName()));
         }
 
         field.setAccessible(true);