Update app.py

app.py

@@ -207,12 +207,16 @@ def parse_color(colorstr):
 
 
 def hex_to_rgb(hex_color):
+    if hex_color.startswith("rgb"):
+        raise ValueError(f"Unexpected color format: {hex_color}")
+
     hex_color = hex_color.lstrip('#')
     r = int(hex_color[0:2], 16) / 255.0
     g = int(hex_color[2:4], 16) / 255.0
     b = int(hex_color[4:6], 16) / 255.0
     return (r, g, b)
 
+
 def do_viz(
     inp_aud,
     inp_bgcolor,