fix :

check_app.py

@@ -189,7 +189,7 @@ def create_pipeline_logic(prompt_text, model_name):
     pipe_signature = signature(b_pipe)
     # Check for the presence of "callback_on_step_end" in the signature
     has_callback_on_step_end = "callback_on_step_end" in pipe_signature.parameters
-    if not has_callback_on_step_end
+    if not has_callback_on_step_end:
         pipe = ProgressPipeline(b_pipe)
         print("ProgressPipeline specal")
     else: