我有错误时，推动它ro的repo。错误说：

在您的.gitlab-ci.yml中发现错误：变量config应该是键值对的散列值可以是散列值

这是怎么回事？
代码：

stages:
  - build_android
  - build_ios
  - run_test

variables:
  ver:
    value: "13"
    options:
      - "13"
      - "13.1"
      - "13.2"
      - "13.2.1"
      - "14.0.1"

build_android:
  stage: build_android
  script:
    - flutter build apk

build_ios:
  before_script:
    - export DEVELOPER_DIR=/Applications/Xcode_${{ver}}.app/Contents/Developer
  stage: build_ios
  script:
    - xcode-select -s $DEVELOPER_DIR
    - flutter build ios --no-codesign

run_test:
  stage: run_test
  script:
    - flutter test