Invalid constraint problem

Good morning,
this is my code


variable x(n)

subject to
   square(x(1)) >=0;  % first constraint
   x(1)^2-4*x(2)>=0;  %second constraint

where P is a definite positive matrix, so without these constraints it all works. Both first constraint and second constraint give me this kind of problem, although they are convex inequalities.
Can someone help me?

FAQ: Why doesn’t CVX accept my problem? [READ THIS FIRST]

They are not DCP inequalities. The second is not convex. The first one happens to be trivial (i.e., it does not constrain x(1) in any way), but it still doesn’t satisfy the rules.