UTR Library Designer Error

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

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

16s rRNA Sequence : ACCUCCUUU

Desired Expression Range : 2555241.00 ~ 902672.55 ( Desired max expression should be larger than that of min )

Number of expression-level intermediates : 16