/etc/raddb/sites-enabled/default

when i add in /etc/raddb/sites-enabled/default

authorize {

if (Framed-Protocol == “PPP”)
{

}

it says :

/etc/raddb/sites-enabled/default[231]: Invalid operator in assignment
Errors reading /etc/raddb/radiusd.conf

how can i check Framed-Protocol is PPP :frowning: