Error: config compilation request returned an error: Invalid input when adding org-slug

[sacherus]

Meta:

CircleCI CLI Version:
0.1.30995+77b1f51 (homebrew)

Operating System:
MacOS
Linux
Checked multiple computers.

CircleCI CLI Diagnostic:

---
CircleCI CLI Diagnostics
---
Debugger mode: false
Config found: /Users/sacherus/.circleci/cli.yml
API host: https://circleci.com
API endpoint: graphql-unstable
OK, got a token.
Trying an introspection query on API...
Ok.

---

Current behavior:

circleci local execute run_tests -c .circleci/config.yml --org-slug github/{NAME}
Error: config compilation request returned an error: Invalid input.

It happens only when adding org-slug. It doesn't work with any, even dummy config.yml.

Expected behavior:

It should work.

When did this begin / Was this previously working?:

It worked maybe 4 years ago.