我尝试在Jenkins中运行groovy脚本，但遇到以下错误：groovy.lang.MissingPropertyException: No such property: COUNTER for class
脚本如下：

def runAzureMockExecution(Map m = [:]) {

    Map args = [
            ENDPOINT : "",
            action : "",
            vmCount : "",
            numSubscriptionId : "",
    ]

    args << m
    println(args)

    def ENDPOINT = args.ENDPOINT
    def action = args.action
    def vmCount = args.vmCount
    def numSubscriptionId = args.numSubscriptionId

    sh("""
        arr=();
        COUNTER=0
        while [  $COUNTER -lt $numSubscriptionId ]; do
        suffix=$RANDOM
        arr+=($suffix" ")
        let COUNTER=COUNTER+1
        done
    """)
}

runAzureMockExecution(
                        ENDPOINT: "https://sample-url.com",
                        action: "ADD",
                        vmCount: 1,
                        numSubscriptionId: 5
                )

有人能帮我吗？我也试着在在线编译器中运行同样的脚本，但得到了和上面一样的错误。