UTR Library Designer Error

Template 5'-UTR Sequence (25NT) : ATTAAAGAGGAGAAATTAACT ( Length should be 25NT ) ,     Additional Constraints for designing 5'-UTR sequence (25NT) : NNNNNNNNNNNNNNNNNNNNNNNNNNNNNN ( Length should be 25NT )

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

16s rRNA Sequence : ACCUCCUUA

Desired Expression Range : 719882.22 ~ 1000000.00

Number of expression-level intermediates : 16