# userGWAS Matrix Error

**URL:** https://isgw-forum.colorado.edu/t/usergwas-matrix-error/880
**Category:** Day 6
**Tags:** genomicsem, r
**Created:** [June 10, 2026, 2:15pm UTC](https://isgw-forum.colorado.edu/t/usergwas-matrix-error/880 "2026-06-10T14:15:14Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![anonymous](https://isgw-forum.colorado.edu/letter_avatar_proxy/v4/letter/a/8491ac/32.png) [@anonymous](https://isgw-forum.colorado.edu/u/anonymous)
#### Post date: [June 10, 2026, 2:15pm UTC](https://isgw-forum.colorado.edu/t/usergwas-matrix-error/880/1 "2026-06-10T14:15:14Z")

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This is a very specific question, but I’ve gotten the error “Error in crossprod(wls.diff, wls.v) : non-conformable arguments Calls: userGWAS”, when running an African-ancestry multivariate gwas. I haven’t been able to find anything online on how to address it. Any of the tutors are familiar with this error? 🙏

> Replying to “This is a very specific question, but I’ve gotten …”:

That seems to me like you’ve got two matrices of different sizes that can’t be multiplied properly… a very specific error indeed! I’d bring this up to the genomicSEM wiki

> Replying to “This is a very specific question, but I’ve gotten …”:

> **[Genomic SEM Users - Google Groups](https://groups.google.com/g/genomic-sem-users?pli=1)**

> Replying to “This is a very specific question, but I’ve gotten …”:

It looks like you’ve already asked the question there!