UTR Library Designer Error

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

Protein Coding Sequence (at least N-term 35NT) : ATGGGGTCTAAAGGCGAAGAA ( Length should be more than 35NT )

16s rRNA Sequence : ACCUCCUUA

Desired Expression Range : 1000.00 ~ 100000.00

Number of expression-level intermediates : 16