UTR Library Designer Error

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

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

16s rRNA Sequence : ACCUCCUUUCU

Desired Expression Range : 114959.00 ~ 1000000.00

Number of expression-level intermediates : 128