Thanks you very much , I was'n aware of low-fee problem

Hi everyone,
20 hours ago i send 2 btc from my Armory wallet, at destination i see this:

29/11/2017 13:52:34   Bitcoin   2.00000000XɃT   Pending (0 confirmations)

Can some of you guys explain to me whats the problem, and the fix if possible.... I send last week 1 btc from the same wallet and everything was fine  

thanks