Update app.py

app.py

@@ -8,7 +8,7 @@ import trimesh
 from trimesh.exchange.gltf import export_glb
 import numpy as np
 import tempfile
-
+import copy
 def predict(_chatbot, task_history):
     chat_query = _chatbot[-1][0]
     query = task_history[-1][0]
@@ -105,7 +105,7 @@ def _parse_text(text):
                 lines[i] = "<br>" + line
     text = "".join(lines)
     return text
-    
+
 def add_text(history, task_history, text):
     task_text = text
     history = history if history is not None else []