means some of your elements have an unfavorable geometric shape, which could lead to instability of the solution. You should try to make your mesh trinagols as much as possible equilaterals. I don't know ansys, but I think what you're saying is just a warning, which means you'll be able to move on with the analysis, but with the warning that the results might be unreliable.
Besides, the difficulty of doing fem analysis is 90% in making a good mesh. .
