Legato error *.adef

Hello
I use legato 18.06.
i have code in the m.adef
requires:
{
dir:
{
[rw] /sys/class/gpio /syst/gpio
}
}

and i get erro
ERROR:
D:\vn\wrksp_legato\MSD084/MSD084.adef:18:5: error: Invalid character ‘[’ in file path.

how to fix it?
i read doc for legato and this syntax is normal.
https://docs.legato.io/latest/defFilesAdef.html#defFilesAdef_requires

I want to turn to /sys/class/gpio/export
from legato app.
how to do it?