running histogram estimation
debug (read file is a list:  False read files list: ['../reads_R1.t.fastq']
Setting maximum kmer length to: 76 bp
computing histograms (from k=21 to k=71): 31 41 61 71 21 51 
ntCard wall-clock time over all k values: 1136 seconds 
fitting model to histograms to estimate best k
could not fit histograms-k61.histo
could not fit histograms-k71.histo
could not fit histograms-k41.histo
could not fit histograms-k51.histo
could not fit histograms-k31.histo
could not fit histograms-k21.histo
could not predict a best k value