openapi-generatorを使いたい2

openapi.yaml

openapi: 3.0.3
info:
  description: "GET/POST IPv4 Address"
  version: "1.0.0"
  title: "openapi-rust"
tags:
  - name: "IP"
paths:
  /ip:
    get:
      responses:
        "200":
          description: "Get Global IPv4 address of the system"
          content:
            application/json:
              schema:
                type: object
                properties:
                  IPv4_address:
                    type: string
                    format: ipv4
                  checked_at:
                    type: string
                    format: date-time
        "500":
          description: "Internal Server Error"
    post:
      requestBody:
        description: "IPv4 address to register"
        content:
          application/json:
            schema:
              properties:
                IPv4_address:
                  type: string
                  format: ipv4
      responses:
        "200":
          description: "The new IPv4 address has been registered"
        "500":
          description: "Internal Server Error"

$ sudo npm install @openapitools/openapi-generator-cli -g

Makefile

generate:
  openapi-generator-cli generate \
    -i ./openapi.yaml \
    -g rust-server \
    -o .

なんか上手くいかないです