Cannot finish release

[kkum]

Hello,
thanks for the software,
I cannot finish a release
Here are the steps i ran (in a pwsh console on windows 11)
Am i missing something ?

[develop ≡] > git flow release track release/0.21.0
Fetching from 'origin'...
Setting up tracking branch for 'release/0.21.0'...
Successfully created tracking branch 'release/0.21.0' from 'origin/release/0.21.0' 
    
[release/0.21.0 ≡] > git flow release finish
Error: unknown branch type:

[release/0.21.0 ≡] > git flow release finish -v
Error: unknown branch type: 

[release/0.21.0 ≡] > git flow overview
Base branches:
==============
  main (root)
  develop → main [auto-update]

Topic branch types:
===================
feature/*:
  Parent: develop
  Merges into develop, Rebases onto from develop

bugfix/*:
  Parent: develop
  Merges into develop, Rebases onto from develop

release/*:
  Parent: main
  Start point: develop
  Merges into main, Merges from main
  Creates tags on finish

hotfix/*:
  Parent: main
  Merges into main, Rebases onto from main
  Creates tags on finish

support/*:
  Parent: main
  none into main, none from main

Active topic branches:
======================
  bugfix/1666-search (bugfix)
  feature/pipeline (feature)
* release/0.21.0 (release)