我已经检查了所有关于同一个错误的主题，尝试了一切，但我无法找到任何东西来帮助我解决我的问题。
我的代码构建一个Docker容器，启动一个flask应用程序并运行一个python脚本，运行测试，然后合并Master。代码如下：

pipeline {
agent any

stages {

   stage('Master merging'){

      steps{
         script{
         passwordVariable = 'password'
         usernameVariable = 'unsername'
            // Variables for input
         if(env.BRANCH_NAME == 'features'||env.BRANCH_NAME == 'main'){
         sh 'git checkout origin/features'
         sh 'git pull'
         sh 'git remote update'
         sh 'git fetch'
         sh 'git checkout origin/main'
         sh 'git merge origin/features'
         withCredentials([usernamePassword(credentialsId : 'GitHub', passwordVariable:'GIT_PASSWORD', usernameVariable:'GIT_USERNAME')]){
            sh "git push http://${GIT_USERNAME}:${GIT_PASSWORD}@github.com/Username/Repo.git"
         }
         }}
   }
   }

   }
}

当我到达舞台（“大师合并”）时，我有以下错误

Masking supported pattern matches of $GIT_PASSWORD
[Pipeline] {
[Pipeline] }
[Pipeline] // withCredentials
[Pipeline] }
[Pipeline] // script
[Pipeline] }
[Pipeline] // stage
[Pipeline] stage
[Pipeline] { (container shutdown)
Stage "container shutdown" skipped due to earlier failure(s)
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // withEnv
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
groovy.lang.MissingPropertyException: No such property: GIT_PASSWORD for class: groovy.lang.Binding
    at groovy.lang.Binding.getVariable(Binding.java:63)

提前感谢您的帮助：）