failed to load translations: failed to unmarshal cs.yaml:

[mysoonyu]

Help need
When i run hugo server with geekdocs template, it complains
hugo server -D
Error: add site dependencies: load resources: loading translations: "/home/vagrant/personalme/hugo/demosite/themes/hugo-geekdoc/i18n/cs.yaml:2:1": failed to load translations: failed to unmarshal cs.yaml: yaml: unmarshal errors:
line 2: cannot unmarshal !!map into []map[string]interface {}

hugo version
Hugo Static Site Generator v0.68.3/extended linux/amd64 BuildDate: 2020-03-25T06:15:45Z
geekdocs source: https://github.com/thegeeklab/hugo-geekdoc/releases/latest/download/hugo-geekdoc.tar.gz

soonyu