UTR Library Designer Error

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

Protein Coding Sequence (at least N-term 35NT) : TTGACAAAACAATATAAAAATTATGTCAATGGCGA ( CDS should start with ATG or GTG )

16s rRNA Sequence : ACCUCCUUA

Desired Expression Range : 500000.00 ~ 1000000.00

Number of expression-level intermediates : 16