fix

core/src/main/java/com/boydti/fawe/Fawe.java

@@ -226,9 +226,7 @@ public class Fawe {
         if (file != null && file.exists()) {
             try {
                 BundledBlockData.getInstance().add(file.toURI().toURL(), false);
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
+            } catch (Throwable ignore) {}
         }
     }
 

core/src/main/resources/extrablocks.json

@@ -1,2 +1,5 @@
 // Add extra blocks here
 // See: https://github.com/sk89q/WorldEdit/blob/master/worldedit-core/src/main/resources/com/sk89q/worldedit/world/registry/blocks.json
+[
+
+]