More than one Character Booster not working on one character

Date & Time: 02/14/2018 08:15 pm
Frequency: once
World name: Diablos
Character name: Ruby Radyx
Retainer name: N/A
NPC name: N/A
Monster name: N/A
Class/Level: Black Mage Lvl 60
Party or solo: Solo
In-game time:
Area and coordinates:
Housing:
Steps:
1. Bought second "tale of.." booster book to gain summoner class booster and shire set
2. Wouldn't let me use the second book
3.

I haven't seen any warnings saying one character can't use more than one booster book, I used the black mage book a couple weeks ago and now was hoping to use the summoner one as well. I submitted a question to the gm's on the game but was rerouted here for an answer. If I can't use more than one book on a character, can I send the book and coffer to my alt character?

Edit: so this is a repost, for some reason I got locked out of the last thread. Mirage Sniper answered that I can't use both at once but I'm not trying to. I used the Black Mage book weeks ago and am now trying to use the Summoner boost book but it isn't working, it keeps being interrupted

Where were you when you tried to use it?