fixed error

app.py

@@ -68,13 +68,6 @@ def inference(
     negative_prompt: str = "ugly, disfigured, low quality, blurry, nsfw",
     
 ):
-    if prompt is None or prompt == "":
-        raise gr.Error("Prompt is required")
-
-    if qr_code_content == "":
-        raise gr.Error("QR Code Content is required")
-
-    pipe.scheduler = SAMPLER_MAP[sampler](pipe.scheduler.config)
 
     guidance_scale = 7.5,
     controlnet_conditioning_scale = 1.5,
@@ -84,6 +77,14 @@ def inference(
     init_image = None
     qrcode_image = None
     use_qr_code_as_init_image = True
+    
+    if prompt is None or prompt == "":
+        raise gr.Error("Prompt is required")
+
+    if qr_code_content == "":
+        raise gr.Error("QR Code Content is required")
+
+    pipe.scheduler = SAMPLER_MAP[sampler](pipe.scheduler.config)
 
     generator = torch.manual_seed(seed) if seed != -1 else torch.Generator()