Problem/Bug Help Me Please!

So, I have permissionsEX Installed on my server, But i can't get it to work

I want to get the default group to interact with pressureplates and everything, also i use heavyspleef, but the default rank cant break blocks, This is my pex for the group default:

groups:
Pleb:
options:
default: true
prefix: '&0[&EPleb&0]&E '
permissions:
- modifyworld.blocks.interact.*
- essentials.fly
- essentials.feed
- tc.yellow


Anyone Please help me!