Issue regarding 'nextflow run evotools/nf-LO'

[Heather1999]

Hello, thank you for developing this tool, I tried to run the following code : nextflow run evotools/nf-LO --source /home/sealight1999/references/GRCH38/GRCh38_no_alt.fna --target /home/sealight1999/references/CHM13/ chm13v2.0_1.fa --aligner minimap2 –outdir /home/sealight1999/references -profile local But encountered following warnings: [c3/9fda46] NOTE: Process PREPROC:tgt2bit (tgt2Bit) terminated with an error exit status (127) -- Execution is retried (1) [ae/47e4dc] NOTE: Process PREPROC:splitsrc (splitsrc) terminated with an error exit status (127) -- Execution is retried (1) [e7/fdb913] NOTE: Process PREPROC:src2bit (src2Bit) terminated with an error exit status (127) -- Execution is retried (1) [fd/3eadf0] NOTE: Process PREPROC:splittgt (splittgt) terminated with an error exit status (127) -- Execution is retried (1) [03/acbfe7] NOTE: Process PREPROC:tgt2bit (tgt2Bit) terminated with an error exit status (127) -- Execution is retried (2) [8e/ecf45f] NOTE: Process PREPROC:splitsrc (splitsrc) terminated with an error exit status (127) -- Execution is retried (2) [22/e11aa5] NOTE: Process PREPROC:src2bit (src2Bit) terminated with an error exit status (127) -- Execution is retried (2) [62/97c512] NOTE: Process PREPROC:splittgt (splittgt) terminated with an error exit status (127) -- Execution is retried (2) [83/bd21fa] NOTE: Process PREPROC:tgt2bit (tgt2Bit) terminated with an error exit status (127) -- Error is ignored [3f/930365] NOTE: Process PREPROC:splitsrc (splitsrc) terminated with an error exit status (127) -- Error is ignored [9e/fdca06] NOTE: Process PREPROC:src2bit (src2Bit) terminated with an error exit status (127) -- Error is ignored [77/94ba10] NOTE: Process PREPROC:splittgt (splittgt) terminated with an error exit status (127) -- Error is ignored WARN: Graphviz is required to render the execution DAG in the given format -- See http://www.graphviz.org for more info.

What could be wrong? Thank you!