I did a mistake with a deck

[Martine Lightfellow]

Hey.
I need help to fix Gavins default deck. I get a blue exclamation mark within his deck builder screen.
Anyone who know how what i need to do for fixing this mistake?

[Somorod]

If I'm not mistaken, the blue exclamation mark appears when your deck, doesn't match the requirements for a skill, so if you are using this deck you are not able to use the skill.

you should check the requirements for the skill and look which cards won't fit in those requirements.

For example: Ultimate Bond allows only spellcasters and machines to have 1400 ATK or more. If you have a single warrior monster with 1400 ATK or more in your deck, your skill will be disabled.