Team, I want to capture a var remoteUrl value coming from jenkinsfile into groovy library that is passed from jenkinsfile and store it in env var to access later. but I can’t seem to do it. any hint what am i missing?

def call(Map config) {
    for (param in ['credentialsId', 'remoteUrl']) {
        if (!config[param]) {
            error "checkoutGit(): missing parameter ${param}"
        }
    }
    env = ["REMOTE_URL=${config.remoteUrl}"]
    final GIT_YX_URL = "ssh://@git-YX"
    final LIB_GIT_YX_MIRROR_URL = "git://git-mirror:111/git-t"
    if (config.remoteUrl) {
        println "Git YX url passed in user job"
        env.add("GIT_YX_MIRROR_URL=${config.remoteUrl}")
        echo "GIT_YX_MIRROR_URL is: ${GIT_YX_MIRROR_URL}"
    } else {
        println "No Git YX url passed in user job, using Library defined Git Mirror URL"
        env.add("GIT_YX_MIRROR_URL=$LIB_GIT_YX_MIRROR_URL")
    }

my jenkinsfile is

def REPO_MIRROR_URL = 'git://git-mirror'
            steps {
                container('main') {
                    script {
                        checkoutUtil(
                            credentialsId: 'git-ssh',
                            remoteUrl: "$REPO_MIRROR_URL",
                        )
                    }

error am getting is

Git YX url passed in user job

Also:   org.jenkinsci.plugins.workflow.actions.ErrorAction$ErrorId: 01e941fa-4301-4ccc-a4ac-f286eb1e7baa
hudson.remoting.ProxyException: groovy.lang.MissingPropertyException: No such property: GIT_YX_MIRROR_URL for class: checkoutUtil
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:66)