diff --git a/library/command b/library/command
index f94ee7f9e33..0f912e0b69e 100755
--- a/library/command
+++ b/library/command
@@ -17,6 +17,12 @@ try:
     cmd = subprocess.Popen(args, shell=False, 
         stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     out, err = cmd.communicate()
+except (OSError, IOError), e:
+    print json.dumps({
+        "failed": 1,
+        "error": str(e),
+        })
+    sys.exit(1)
 except:
     print json.dumps({
         "failed" : 1,