Error in reading your fastafile, at positio-1 Blank name

Hi, I am totally new to Mothur and Next-gen sequencing, so forgive me if this is an easy to solve problem.
I am basically following the example MiSeq SOP given in the wiki but using my own data. I have produced aligned sequences and generated stability.trim.contigs.good.unique.align, however when I try to run the command summary.seqs(fasta=stability.trim.contigs.good.unique.align, count=stability.trim.contigs.good.count_table) I recieve the following message “Error in reading your fastfile at position -1. Blank name”
Error: process 0 only processed 1 of 237812 sequences assigned to it, quitting

I am running Mothur v 1.33 on Windows 7 - any help much appreciated

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Welcome to the mothur community! The error you are getting usually indicates mothur is at the end of a file, or is having trouble reading a file. I suspect that one of the processes is failing for some reason. Could you be running out of memory? Have you tried running the command with processors=1? The more processors you use the more memory is required.

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Ok great, thanks for the help!