Hi, I'm starting up my own craftbukkit server and need help! I am testing out my first rank guest and have given a few essentials commands. However, they cannot build or chat anything unless they are OP. Please help! Here are my nodes.

groups:
guest:
default: true
prefix: ' &7[Guest]&f '
permissions:
- modifyworld.chat
- essentials.balance
- essentials.pay
- essentials.sell
- essentials.worth
- essentials.afk
- essentials.help
- essentials.help.deadbolt
- essentials.helpop
- essentials.me
- essentials.msg
- essentials.suicide
- essentials.tpahere
- essentials.tpaccept
- essentials.tpdeny