add warning for seqs >600

app.py

@@ -227,7 +227,7 @@ def predict(
     num_models,
     mode="web",
 ):
-    if not os.path.exists("/home/user/app"):  # crude check if on spaces
+    if os.path.exists("/home/user/app"):  # crude check if on spaces
         if len(sequence) > 600:
             raise gr.Error(
                 f"Your sequence is too long ({len(sequence)}). "