Console says ret == 0 many times

Hello,

since Unity 5.1.2 i got this errors in console while NOT in playmode. Multiple times it says just "ret == 0" in console. Can´t doubleclick for more informations.

Editor.log got this for me:

 Subscribe to USB device events
 Issue TrimJob to reduce GI Cache size to maximum 10GB at: '/Users/tobias/Library/Caches/com.unity3d.UnityEditor/GiCache'
 TrimDiskCacheJob: Current cache size 0mb
 Refresh: detecting if any assets need to be imported or removed ... ret == 0
  
 (Filename: /Users/builduser/buildslave/unity/build/PlatformDependent/OSX/LocalFileSystemOSX.mm Line: 287)
 
 ret == 0

There over 70 errors about "ret == 0". Didn´t know anything about that "LocalFileSystemOSX.mm" file, and filepath did not exist...

Have updated to 5.2.1 right now, Same Errors, Same count of erros...

Now sometimes i get this:

 ret == 0
 UnityEditor.BuildPlayerWindow:BuildPlayerAndRun()