diff --git a/rdagent/app/cli.py b/rdagent/app/cli.py
index dca1492a6..69350c09a 100644
--- a/rdagent/app/cli.py
+++ b/rdagent/app/cli.py
@@ -33,14 +33,14 @@ def ui(port=80, log_dir="", debug=False):
     start web app to show the log traces.
     """
     with rpath("rdagent.log.ui", "app.py") as app_path:
-        cmds = ["streamlit", "run", app_path, f"--server.port={port}"]
+        cmds = ["streamlit", "run", str(app_path), f"--server.port={port}"]
         if log_dir or debug:
             cmds.append("--")
         if log_dir:
             cmds.append(f"--log_dir={log_dir}")
         if debug:
             cmds.append("--debug")
-        subprocess.run(cmds)
+        subprocess.run(" ".join(cmds), shell=True)  # shell=True will make the environment work better.
 
 
 def app():