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Sorry i can't reproduce this bug now, but my phabricator regularly updated and we working in this project and the source of this bug may be earlier.

any ideas how i can fix this

What specifically are you trying to do that needs fixing.

I want to add a new member

What is the Join Policy of the project set to?

./policy show PHID-PROJ-<hash>
OBJECT

<project :)>

CAPABILITIES

view
  All Users
  Logged in users can take this action.

  Members of a project can always view it.

edit
  Administrators
  Administrators can take this action.

join
  Administrators
  Administrators can take this action.

  Users who can edit a project can always join it.

And what is your account?

I'm an admin

i try do ./policy unlock PHID-PROJ-<hash>
all policy reset for all users but button "Add members" still inactive

Can you show us a screenshot of the top section of the "Members" page for the project? It should look something like this:

Is this a Parent Project you're trying to edit? That is, does the project has subprojects?

You need to add members directly to subprojects. Parent projects are just the sums of all subproject members.

Maybe we can make the text more clear here.

Yes, this project has subproject.

Thanks, that helped.

I'm surprised we don't spawn a dialog here, so we'll clear that up. Thanks for the report!