Update app.py

app.py

@@ -167,7 +167,7 @@ def infer(
                 cn_mode,
                 pipeline_mgr.get_hed_detector()
             )
-            params['controlnet_conditioning_scale'] = cn_strength
+            params['controlnet_conditioning_scale'] = float(cn_strength)
             
         if ip_enable:
             pipe.load_ip_adapter(IP_ADAPTER, subfolder="models", weight_name=IP_ADAPTER_WEIGHT_NAME)