I am creating a sketch database from ~1500 genomes. These are all in individual FASTA files. When using multiple processors I often encounter the error:
ERROR: Did not find fasta records in "GCF_000755225.1_genomic.fna"

I have examined this file and it is a valid FASTA file with a single sequence. Note, that using different numbers of processors results in a different input file causing the error. Moreover, the sketch database builds properly if I use a single processor.

I am running Mash as follows:
mash sketch -p 23 -o ../gtdb *.fna