From 7d3c868d0a67fe7cba6df412bd5f34ec8a5d289d Mon Sep 17 00:00:00 2001
From: "Yuichiro Tachibana (Tsuchiya)" <t.yic.yt@gmail.com>
Date: Mon, 18 Mar 2024 23:35:24 +0900
Subject: [PATCH] Detailed error message for wasm_utils.get_registered_app()
 (#7572)

* Detailed error message for wasm_utils.get_registered_app()

* add changeset

---------

Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: Ali Abdalla <ali.si3luwa@gmail.com>
---
 .changeset/major-results-stick.md |  5 +++++
 gradio/wasm_utils.py              | 11 ++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/major-results-stick.md

diff --git a/.changeset/major-results-stick.md b/.changeset/major-results-stick.md
new file mode 100644
index 000000000000..1b7bef898119
--- /dev/null
+++ b/.changeset/major-results-stick.md
@@ -0,0 +1,5 @@
+---
+"gradio": minor
+---
+
+feat:Detailed error message for wasm_utils.get_registered_app()
diff --git a/gradio/wasm_utils.py b/gradio/wasm_utils.py
index c4cba87d9a25..bd78667629a1 100644
--- a/gradio/wasm_utils.py
+++ b/gradio/wasm_utils.py
@@ -46,5 +46,14 @@ def register_app(_app):
     app_map[app_id] = _app
 
 
+class GradioAppNotFoundError(Exception):
+    pass
+
+
 def get_registered_app(app_id: str):
-    return app_map[app_id]
+    try:
+        return app_map[app_id]
+    except KeyError as e:
+        raise GradioAppNotFoundError(
+            f"Gradio app not found (ID: {app_id}). Forgot to call demo.launch()?"
+        ) from e