Absolutely IMO. Maybe try asking to have the charges dropped because of it. Likely they will just adjourn at that point. But have the proof that you sent the disclosure request. You sent registered mail right? so you have a signature of someone who recieved it, right?
I just read your other post. Your last adjournment was because you couldn't attend court for some school thing, right? Thats your fault. But if you do get this adjournment for non-disclosure this will be the crowns fault. You might try an 11b motion before your next court date.
Also be aware that they may try to hand you the disclosure package at the trial. Dont take it until after the adjournment and let the JP know you need more time to properly defend yourself.
And finaly please, do yourself a favor and stop asking these questions the day before your trial. Take some time to prepare. I hope things go well for you.
Let us know how it goes.