UTR Library Designer Error

Template 5'-UTR Sequence (25NT) : TTATAGGTAAGAGAGGAATGTACAC ,     Additional Constraints for designing 5'-UTR sequence (25NT) : NNNNNNNNNNNNNNNNNNNNNNNNN

Protein Coding Sequence (at least N-term 35NT) : ATGAAAAAAAGAAAGAGGCGAAACTTTAAAAGGTTC

16s rRNA Sequence : UCCUUUCUA

Desired Expression Range : 864795.40 ~ 102672.55 ( Desired max expression should be larger than that of min )

Number of expression-level intermediates : 32