diff --git a/BauSystem_15/src/de/steamwar/bausystem/utils/FlatteningWrapper15.java b/BauSystem_15/src/de/steamwar/bausystem/utils/FlatteningWrapper15.java
index a1579c29..71a4325e 100644
--- a/BauSystem_15/src/de/steamwar/bausystem/utils/FlatteningWrapper15.java
+++ b/BauSystem_15/src/de/steamwar/bausystem/utils/FlatteningWrapper15.java
@@ -30,13 +30,14 @@ import com.sk89q.worldedit.extent.clipboard.io.BuiltInClipboardFormat;
 import com.sk89q.worldedit.extent.clipboard.io.ClipboardFormats;
 import com.sk89q.worldedit.extent.clipboard.io.ClipboardReader;
 import com.sk89q.worldedit.extent.clipboard.io.ClipboardWriter;
-import com.sk89q.worldedit.function.mask.AbstractExtentMask;
+import com.sk89q.worldedit.function.mask.Mask;
 import com.sk89q.worldedit.function.mask.Mask2D;
 import com.sk89q.worldedit.function.operation.ForwardExtentCopy;
 import com.sk89q.worldedit.function.operation.Operations;
 import com.sk89q.worldedit.math.BlockVector3;
 import com.sk89q.worldedit.math.transform.AffineTransform;
 import com.sk89q.worldedit.regions.CuboidRegion;
+import com.sk89q.worldedit.regions.Region;
 import com.sk89q.worldedit.regions.selector.CuboidRegionSelector;
 import com.sk89q.worldedit.session.ClipboardHolder;
 import com.sk89q.worldedit.world.World;
@@ -167,10 +168,10 @@ public class FlatteningWrapper15 implements FlatteningWrapper.IFlatteningWrapper
                 blocks.add("minecraft:" + pasteOptions.getColor().name().toLowerCase() + "_concrete_powder");
                 blocks.add("minecraft:" + pasteOptions.getColor().name().toLowerCase() + "_carpet");
 
-                e.setMask(new AbstractExtentMask(clipboard) {
+                e.setMask(new Mask() {
                     @Override
                     public boolean test(BlockVector3 blockVector3) {
-                        BaseBlock block = getExtent().getFullBlock(blockVector3);
+                        BaseBlock block = clipboard.getFullBlock(blockVector3);
                         String blockName = block.toString().toLowerCase();
                         return blocks.contains(blockName);
                     }
@@ -180,6 +181,10 @@ public class FlatteningWrapper15 implements FlatteningWrapper.IFlatteningWrapper
                     public Mask2D toMask2D() {
                         return null;
                     }
+
+                    public Mask copy() {
+                        return this;
+                    }
                 });
             }
             System.out.println("ChangeColor: " + stop("changeColor"));
@@ -199,9 +204,9 @@ public class FlatteningWrapper15 implements FlatteningWrapper.IFlatteningWrapper
 
             start("reset");
             if (pasteOptions.isReset()) {
-                e.setBlocks(new CuboidRegion(toBlockVector3(pasteOptions.getMinPoint()), toBlockVector3(pasteOptions.getMaxPoint())), Objects.requireNonNull(BlockTypes.AIR).getDefaultState().toBaseBlock());
+                e.setBlocks((Region) new CuboidRegion(toBlockVector3(pasteOptions.getMinPoint()), toBlockVector3(pasteOptions.getMaxPoint())), Objects.requireNonNull(BlockTypes.AIR).getDefaultState().toBaseBlock());
                 if (pasteOptions.getWaterLevel() != 0) {
-                    e.setBlocks(new CuboidRegion(toBlockVector3(pasteOptions.getMinPoint()), toBlockVector3(pasteOptions.getMaxPoint()).withY(pasteOptions.getWaterLevel())), Objects.requireNonNull(BlockTypes.WATER).getDefaultState().toBaseBlock());
+                    e.setBlocks((Region) new CuboidRegion(toBlockVector3(pasteOptions.getMinPoint()), toBlockVector3(pasteOptions.getMaxPoint()).withY(pasteOptions.getWaterLevel())), Objects.requireNonNull(BlockTypes.WATER).getDefaultState().toBaseBlock());
                 }
             }
             System.out.println("Reset: " + stop("reset"));