Hi the1Dmitri. Welcome to the VC forum.
I just tested this command to make sure everything is working and it seems to work perfectly on my system.
In order to help diagnose the problem please provide us with the following information:
1 - The version of Kodi that you are using.
2 - Attach your VoxCommando log. First make sure that "Enable log" is checked on the main VC menu under options. Then be sure to issue a few voice commands to test this command, using, if possible, a few different shows, seasons, and episode numbers. Then close VC and reply here and attach your log.
for more about logging etc please read this:
http://voxcommando.com/mediawiki/index.php?title=Getting_support#When_You_Ask