The Item cannot be used - SP Booster

Hello!

I bought Skill Exp. Booster 200% for 2 hrs. When I want to start it, it says:
"The Item Cannot be used at the moment."

I ask you, why??? There is written that it can be used simultaneously with premium item. And i have got premium of course. I am so disappointed about this.

Can someone help me please? Thank you!

maybe it means u cant use it if ur premium is still in time,only once u have done the 3 or 5 hrs depending which u got?

I have got 3 hrs ticket .. i try to use it, when was ticket in a flow, and nothing. So I try to use it, when ticket ended, and still the same.. :/ 112 Silks are gone for nothing.. f*cking GAYMAX...

same here, dont work xd :/

This is a bug at iSRO.
There stands you can use it with Premium, but it won't work :p.
They activated it like a Gold/Silver Time TIcket, so you can't use it simultaneosly. Sell it for Gold or wait until your premium finished :p

but for example... a skill exp booster for 1h ( 100%), it's like x2 rates of sp?
It is worth?

it is worth if u want to speed lil up.