UTR Library Designer Error

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

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

16s rRNA Sequence : ACCUCCUUU

Desired Expression Range : 255241.00 ~ 992672.55

Number of expression-level intermediates : 16