diff --git a/src/idle.c b/src/idle.c
index d02b199f32..3b15b30480 100644
--- a/src/idle.c
+++ b/src/idle.c
@@ -265,7 +265,7 @@ static void rt_thread_idle_entry(void *parameter)
  */
 void rt_thread_idle_init(void)
 {
-    int i;
+    rt_ubase_t i;
     char tidle_name[RT_NAME_MAX];
 
     for (i = 0; i < _CPUS_NR; i++)
diff --git a/tools/building.py b/tools/building.py
index 90c1c871b6..55baf236cf 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -105,8 +105,11 @@ class Win32Spawn:
         try:
             proc = subprocess.Popen(cmdline, env=_e, shell=False)
         except Exception as e:
-            print ('Error in calling:\n' + cmdline)
-            print ('Exception: ' + e + ': ' + os.strerror(e.errno))
+            print ('Error in calling command:' + cmdline.split(' ')[0])
+            print ('Exception: ' + os.strerror(e.errno))
+            if (os.strerror(e.errno) == "No such file or directory"):
+                print ("\nPlease check Toolchains PATH setting.\n")
+
             return e.errno
         finally:
             os.environ['PATH'] = old_path