Admixture: "PLINK Input file error"

Question

[dec986]

I'm attempting to run the admixture program with 1000 genomes thus:

admixture --supervised tmp_bcftools_norm.ped 26

and I get the error:

****                   ADMIXTURE Version 1.3.0                  ****
****                    Copyright 2008-2015                     ****
****           David Alexander, Suyash Shringarpure,            ****
****                John  Novembre, Ken Lange                   ****
****                                                            ****
****                 Please cite our paper!                     ****
****   Information at www.genetics.ucla.edu/software/admixture  ****

Random seed: 43
Point estimation method: Block relaxation algorithm
Convergence acceleration algorithm: QuasiNewton, 3 secant conditions
Point estimation will terminate when objective function delta < 0.0001
Estimation of standard errors disabled; will compute point estimates only.
PLINK Input file error

this is similar, but not identical to Admixture give me an error with ped "PLINK Input file error" and with bed format quit with error message "Abort trap6

I have literally no idea what is causing this problem, this error message says nothing.

How can I debug this?

[4galaxy77]

First advise. would be to use .bed .bim .fam format and not .ped.

[dec986]

for reasons that I'm unable to discern, this worked until the next error