Fenix a320 descending help

Hi there am new on here . Can’t get the fenix a320 to descend it just keeps climbing. I’ve got throttles set to CL . But we’re gages are there’s some thing what says A Locked in green writing not sure if that my problem could some one please help with this thanks

You were flying way too slow, hence your A320 activated the automatic stall protection which consists of automatic full thrust application.
Once the low speed conditions has been cleared, move the thrust levers out of the CL detent, and then back to CL.

I was at FL24 and still going higher . What’s the a locked message mean m8

2400ft isn’t very high. Do mean FL 240?
A (alpha) lock means that the slats are extended and can’t be retracted due to the low speed/high AoA