fix bug

start.py

@@ -44,9 +44,8 @@ def start():
         ('git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*"', olas_dir),
         ("git remote update", olas_dir),
         ("git fetch --all", olas_dir),
-        ("git show-ref --verify --quiet \"refs/remotes/origin/fix/mech-packages\"", olas_dir),
-        ("git checkout main, olas_dir),
-        ("git pull origin main, olas_dir),
+        ("git checkout main", olas_dir),
+        ("git pull origin main", olas_dir),
         ("git checkout main", mech_dir),
         ("git pull origin main", mech_dir),
         ("pip install -e .", os.path.join(olas_dir, "benchmark")),