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ok so i tried to add another row again with DDD<return>DDD and it said the knot structure of my pattern is incorrect... Does anyone know what I should do?

yeah that happened to me too.

cmari I'd have to see the pattern before I can tell you what's wrong.

Are you using eight strings? Because if you did DDD <enter> DDD, that wouldn't work because it has to alternate from four knots to three, because since there is an even number of strings, the strings on the outside always have to be taken out one row, and put back in for the next. So an example to make it correct is to put DDD <enter> DDDD. Hope this helps.