I was flying, suddenly this warning appeared on the ECAM and my plane didn't ascend, it stayed at 8,000 feet... could you help me?

Warning a380
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I was flying, suddenly this warning appeared on the ECAM and my plane didn't ascend, it stayed at 8,000 feet... could you help me?
Go to the altitude knob, then pull back on it put your Flight level in then pull the Vertical speed knob back and put your vertical speed in
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- Official Post
There are two different things going on there.
1) You are before an altitude constraint. The departure requires you to maintain 8000ft or lower (note the -FL80 on the ND, the '-' indicating "at or below"). Check the route ahead, at some point this altitude constraint is going to be lifted and at that point normal climb will resume. To climb immediately and disregard the constraint you can always pull out the altitude knob to continue climbing with OP CLB. In the real world you would need ATC permission for this.
2) The barometer reference seems to be set to STD already. Normally the assistance should take care of this automatically. But if you manually adjust the pressure setting or switch to STD pressure before the assistance does then the assistance assumes you know what you are doing and goes into standby. When ever you switch to STD pressure you need to do so for all three altimeters. The altimeter cross check that is being triggered in your screenshot shows that you or the assistance did not in fact switch all three altimeters to STD. One of them, the Integrated Standby Instrument System (ISIS) is not set properly. Push the knob of the small standby PFD in to set it to STD pressure as well.