fix

script/buct-cource-copy.js

@@ -40,9 +40,9 @@
                 });
             } catch {
                 await new Promise((resolve) => setTimeout(resolve, 1000));
-                return poll();
+                return this.poll();
             }
-            poll();
+            this.poll();
             try {
                 const data = await res.json();
                 if (data.status !== "nothing") {