Multiple output file properties with name 'subchartsDir'

[mourya09]

I am using Plugin's task for updating its dependencies:
task helmBuildDependencies1(type: HelmBuildDependencies){
chartDir = file('src/main/helm')
}

But it gives me below error:

 Task :helmBuildDependencies1 FAILED
:helmBuildDependencies1 (Thread[Execution worker for ':',5,main]) completed. Took 0.009 secs.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':helmBuildDependencies1'.
> Multiple output file properties with name 'subchartsDir'

* Try:
Run with --stacktrace option to get the stack trace. Run with --debug option to get more log output. Run with --scan to get full insights.

I am struck as I cannot use this plugin for updating the plugin.