vagrant.provisioners.ansible.compatibility_mode_not_detected

Error message

vagrant.provisioners.ansible.compatibility_mode_not_detected

What it means

Error "vagrant.provisioners.ansible.compatibility_mode_not_detected" thrown in hashicorp/vagrant.

Source

Thrown at plugins/provisioners/ansible/provisioner/base.rb:90

          end
          
          if @gathered_version_major
            if config.compatibility_mode == Ansible::COMPATIBILITY_MODE_AUTO
              detect_compatibility_mode
            elsif @gathered_version_major.to_i < 2 && config.compatibility_mode == Ansible::COMPATIBILITY_MODE_V2_0
              # A better version comparator will be needed
              # when more compatibility modes come... but so far let's keep it simple!
              raise Ansible::Errors::AnsibleCompatibilityModeConflict,
                ansible_version: @gathered_version,
                system: @control_machine,
                compatibility_mode: config.compatibility_mode
            end
          end

          if config.compatibility_mode == Ansible::COMPATIBILITY_MODE_AUTO
            config.compatibility_mode = Ansible::SAFE_COMPATIBILITY_MODE

            @machine.env.ui.warn(I18n.t("vagrant.provisioners.ansible.compatibility_mode_not_detected",
              compatibility_mode: config.compatibility_mode,
              gathered_version: @gathered_version_stdout) +
            "\n")
          end

          unless Ansible::COMPATIBILITY_MODES.slice(1..-1).include?(config.compatibility_mode)
            raise Ansible::Errors::AnsibleProgrammingError,
              message: "The config.compatibility_mode must be correctly set at this stage!",
              details: "config.compatibility_mode: '#{config.compatibility_mode}'"
          end

          @lexicon = ANSIBLE_PARAMETER_NAMES[config.compatibility_mode]
        end

        def check_files_existence
          check_path_is_a_file(config.playbook, :playbook)

          check_path_exists(config.inventory_path, :inventory_path) if config.inventory_path

View on GitHub (pinned to 35f3160f4a)

When it happens

Trigger: Thrown at plugins/provisioners/ansible/provisioner/base.rb:90 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of hashicorp/vagrant@35f3160f4a (2026-08-21). Data as JSON: /api/errors/52c18ac65cfbd7af. Report an issue: GitHub.