Update app.py

app.py

@@ -89,7 +89,7 @@ def generate_image(prompt, image):
     image = Image.fromarray(image)
     image.save(INPUT_DIR+'/input.png', format='PNG')
     
-    prefix_filename = random.randint(0, 999999)
+    prefix_filename = str(random.randint(0, 999999))
     queue_reqs.add(prefix_filename)
     process = None
     try: