User and Group not set for Rpm

Hi

I am using the latest nebula gradle plugin version '4.3.0', here is my code below:

apply plugin: 'nebula.ospackage'

buildscript {
	dependencies {
		classpath 'com.netflix.nebula:gradle-ospackage-plugin:3.4.0'
	}
}

task createTmp(type: Copy) {
	into 'build/tmpDist'
	
	from("${rootDir}/shellscripts") {
		include '*.sh'
		fileMode 0755
	}
}

ospackage {
	packageName = "utils"
    version = "1"
    release = "1"
    arch = NOARCH
    os = LINUX

    packageDescription = "This is test"
    sourcePackage = "utils-src-1.0.1-1.noarch.rpm" // does not exist
    
	user 'tomcat'
    permissionGroup 'app'
    
    postUninstall = file("${rootDir}/postUninstall.sh")
    
    into "/app/test/utils-1.0.0.1-1" 
    from('build/tmpDist') { 
        include '**/*' 
        exclude '*.sh'
    }
    from('build/tmpDist') { 
        include '*.sh' 
        fileMode 0755
    }
}

buildRpm {
	addParentDirs = false
	
	link("/app/test/utils", "/app/test/utils-1.0.0.1-1")	
}

I use the following command to build the RPM "gradle clean createTmp buildRpm". Any idea what could be wrong here?

Thanks Sri