GUI "didn't compile properly"

Status
Fixed
Issue description

I'm probably missing something obvious but my GUI doesn't compile properly and thus i can't launch the mod. Please help :(

Issue comments

The problem is > char in your GUI that is reserved for tokens such as <VAR:valueofvariable>.

We will add option to espace the < and > chars so one could use them in text as \> and \< where \ is used for escaping the special token system.

For now, avoid using < and > characters inside text labels.