UTR Library Designer Error

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

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

16s rRNA Sequence : ACCUCCUUA

Desired Expression Range : 1002.55 ~ 1000000.00

Number of expression-level intermediates : 16