UTR Library Designer Error

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

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

16s rRNA Sequence : 1000000

Desired Expression Range : 1002.55 ~ 102672.55

Number of expression-level intermediates : 16