UTR Library Designer Error

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

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

16s rRNA Sequence : ACCUCCUUA

Desired Expression Range : 50.00 ~ 2800.00

Number of expression-level intermediates : 16