UTR Library Designer Error

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

Protein Coding Sequence (at least N-term 35NT) : TAC AGA CTA GTA TCT CCT TAT TAA AGT TAA ACA AAA TTA TTT CTA CAG GGG AAT TGT TAT CCG CTC ACA ATT CCA ( CDS should start with ATG or GTG )

16s rRNA Sequence : ACCUCCUUA

Desired Expression Range : 1002.55 ~ 102672.55

Number of expression-level intermediates : 16