How to parse a JSON array in groovy

I have the following array which I would like to access the key-value pairs in my Jenkinsfile.

[
    {
        "AppName": "app1",
        "version": "1.0.0.1"
    },
    {
        "AppName": "app2",
        "version": "1.0.0.2"
    },
    {
        "AppName": "app3",
        "version": "1.0.0.3"
    }
]

I would like to get the app name and version and download the applications from my repository via a curl command. I already tried this solution but doesn't work. I get the error on my jenkins console hudson.remoting.ProxyException: net.sf.json.JSONException: Invalid JSON String . I don't know what else I am doing wrong. My plan is to download the apps with following URL for each app name and version from the array.

sh "curl https://example.com/${AppName}/${version}/${AppName}-${version}.zip -O"

Here is my jenkinsfile

node { 
    stage ('checkou') {
        checkout([$class: 'GitSCM', branches: [[name: '*/master']], doGenerateSubmoduleConfigurations: false, extensions: [[$class: 'SparseCheckoutPaths', sparseCheckoutPaths: [[path: 'projectA/testProjectfile.json']]]], submoduleCfg: [], userRemoteConfigs: [[url: 'ssh://myrepository.com/apps/projectA.git']]])
    }
    stage ('read file') {
        def data = readFile(file: "${WORKSPACE}/projectA/testProjectfile.json")
        echo "$data"
        def list = new JsonSlurper().parseText( data )
        list.each { println it }
        
    }
    
    stage ('download app') {
        sh "curl https://example.com/${AppName}/${version}/${AppName}-${version}.zip -O"
    
    }
}

That is my Jenkinsfile and here is the log when I run the pipeline

[Pipeline] echo
[
    {
      "AppName": "app1",
      "version": "1.0.0.1"
    },
    {
      "AppName": "app2",
      "version": "1.0.0.2"
    },
    {
      "AppName": "app3",
      "version": "1.0.0.3"
    }
]
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
hudson.remoting.ProxyException: net.sf.json.JSONException: Invalid JSON String
    at net.sf.json.JSONSerializer.toJSON(JSONSerializer.java:143)
    at net.sf.json.JSONSerializer.toJSON(JSONSerializer.java:103)
    at net.sf.json.groovy.JsonSlurper.parseText(JsonSlurper.java:80)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)