gemma-wrapper:279:in `<main>': Expected GEMMA -a genotype file switch (RuntimeError)

[KizBaolin]

Hi, I used the latest gemma-wrapper and gemma with the following command and encounted an error. Can you help out where is the issue happen?
gemma-wrapper --json
--loco --
--bfile prune
-p phe_tail.txt
-gk
-debug > K.json

gemma-wrapper 0.99.6 (Ruby 2.0.0) by Pjotr Prins 2017-2022

NOTE: gemma-wrapper is soon to be replaced
Using GEMMA 0.98.6 (2022-08-05) by Xiang Zhou, Pjotr Prins and team (C) 2012-2022

Found 0.98.6, comparing against expected v0.98.4
GEMMA 0.98.6 (2022-08-05) by Xiang Zhou, Pjotr Prins and team (C) 2012-2022
Academic tradition requires you to cite works you base your article on.
When using programs that use GNU Parallel to process data for publication
please cite:

@Article{Tange2011a,
title = {GNU Parallel - The Command-Line Power Tool},
author = {O. Tange},
address = {Frederiksberg, Denmark},
journal = {;login: The USENIX Magazine},
month = {Feb},
number = {1},
volume = {36},
url = {http://www.gnu.org/s/parallel},
year = {2011},
pages = {42-47},
doi = {http://dx.doi.org/10.5281/zenodo.16303}
}

(Feel free to use \nocite{Tange2011a})

This helps funding further development; AND IT WON'T COST YOU A CENT.
If you pay 10000 EUR you should feel free to use GNU Parallel without citing.

If you send a copy of your published article to tange@gnu.org, it will be
mentioned in the release notes of next version of GNU Parallel.

/gpfs/home/zhangbl/software/GWAS_software/gemma-wrapper-master/bin/gemma-wrapper:279:in `

': Expected GEMMA -a genotype file switch (RuntimeError)