Rsync error: some files/attrs were not transferred?

I use circle ci to deploy watch and deploy my production branch, which is a react, docker web app. on the last deploy this started showing up on the deploying to server step. I’m having trouble on where to start debugging this. any help would be much appreciated.

this is the error line:
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1207) [sender=3.1.3]

Exited with code exit status 23

Update this seems to be the line causing the problem.

rsync: failed to set times on “/home/app/bear-hands-pro/client/node_modules/.cache/terser-webpack-plugin/content-v2/sha512/be”: Operation not permitted (1)
rsync: recv_generator: mkdir “/home/app/bear-hands-pro/client/node_modules/.cache/terser-webpack-plugin/content-v2/sha512/be/dc” failed: Permission denied (13)
*** Skipping any contents from this failed directory ***

not sure why it’s just that plugin