UTR Library Designer Error

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

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

16s rRNA Sequence : ACGUCCUUA

Desired Expression Range : 1002.55 ~ 9999999999.00 ( Desired max expression should be smaller than 1000000 )

Number of expression-level intermediates : 16