Npx retool-ccl dev issue

I having an issue with the npx retool-ccl.

npx retool-ccl deploy works fine. but I get the following when I run npx retool-ccl dev.
npx retool-ccl dev
Generating & updating manifest...
Build succeeded πŸ”¨
Sending updated code to Retool πŸ“¨...
Error creating new version of custom component library: An unknown error was returned by ``https://retool.ourdomain.net/api/v2:`` status code: 400, error: Bad Request.
Retrying... (2 of 5)
Error creating new version of custom component library: An unknown error was returned by ``https://retool.outdomain.net/api/v2:`` status code: 400, error: Bad Request.

I haven’t updated our on-prem retool in a while and I don’t think I’ve updated the cli either.
I am using v 1.9 of the cli and retool version is 3.284.4

Any workarounds you have let me know. Thanks