UTR Library Designer Error

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

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

16s rRNA Sequence : ACCUCCUU

Desired Expression Range : 1002.55 ~ 1002672.55 ( Desired max expression should be smaller than 1000000 )

Number of expression-level intermediates : 16