diff --git a/mbed/mbed.py b/mbed/mbed.py
index e9df7e32..aab726b9 100755
--- a/mbed/mbed.py
+++ b/mbed/mbed.py
@@ -477,6 +477,9 @@ def cleanup():
         return True
 
     def clone(url, name=None, depth=None, protocol=None):
+        if any(os.access(os.path.join(path, name), os.X_OK) for path in os.environ["PATH"].split(os.pathsep)) == False:
+            raise ProcessException(1, "hg file is not exist")
+
         if verbose or very_verbose:
             popen([hg_cmd, 'clone', formaturl(url, protocol), name] + (['-v'] if very_verbose else ([] if verbose else ['-q'])))
         else: