serie buttom not available

I am running the night skin on XBMC. I have moved my directory where i stored all my series, and tried to add the new location. Once i did this the button 'Serie' in the main menu disapeared.
When i go to the options of the skin, where i can choose which buttons i can hide from the menu I see that the button of serie is not selected to hide but it is red and i cant select it.

any idea how to fix ?