Nomad jobs failed to launch command with executor

We have a nomad cluster consisting of 3 clusters and 2 clients. Nomad version is 1.2.2 . Nomad and consul services are up and running.

2021-12-02T07:29:12.109-0500 [ERROR] client.alloc_runner.task_runner: running driver failed: alloc_id=65004c1f-d310-9d0b-9bf5-644863e061bc task=javatesttask error=“failed to launch command with executor: rpc error: code = Unknown desc = failed to create container(2c8c9309_965c_c189_8a5b_04b571d20053): /opt/nomad/alloc/65004c1f-d310-9d0b-9bf5-644863e061bc/javatesttask is not an absolute path or is a symlink”

Please find the below job file.

job “javatest” {
datacenters = [“dc1”]

group “javagroup” {
count = 1
task “javatesttask” {
driver = “java”

      config {
                                    jar_path = "local/Hello.jar"
                                    jvm_options = ["-Xmx2048m", "-Xms256m"]

                            }

            artifact {
                            source = "http://gitlab-ce.ivycomptech.co.in/devopscop/nomad/blob/master/Hello.jar"
                            destination = "local/"
    }

}
}
}