From 90f5f9a3e4ab3f56c8d9dd873b2205fefa2c7aec Mon Sep 17 00:00:00 2001
From: Robert Nishihara <robertnishihara@gmail.com>
Date: Wed, 11 Dec 2019 14:56:14 -0800
Subject: [PATCH] Fix error message when failing to start UI if grpcio not
 installed. (#6433)

---
 python/ray/services.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/python/ray/services.py b/python/ray/services.py
index fe59035fe..9ceb435ae 100644
--- a/python/ray/services.py
+++ b/python/ray/services.py
@@ -1070,10 +1070,11 @@ def start_dashboard(host,
         import aiohttp  # noqa: F401
         import psutil  # noqa: F401
         import setproctitle  # noqa: F401
+        import grpc  # noqa: F401
     except ImportError:
         raise ImportError(
             "Failed to start the dashboard. The dashboard requires Python 3 "
-            "as well as 'pip install aiohttp psutil setproctitle'.")
+            "as well as 'pip install aiohttp psutil setproctitle grpcio'.")
 
     process_info = start_ray_process(
         command,