my code below:
class UninstallSystemApp(var mContext: Context) : AsyncTask<Void, Void, Result?>() {
val appPackage = "a855solution.gais.app"
override fun doInBackground(vararg p0: Void?): Result? {
return RootManager.getInstance().uninstallSystemApp(AppManager.getAppApkPathInstalled(mContext, appPackage))
}

    override fun onPreExecute() {
        println("Uninstalling package  $appPackage .")
        super.onPreExecute()
    }

    override fun onPostExecute(result: Result?) {
        println("Uninstall $appPackage ${result?.result} with the message  ${result?.message}")
        super.onPostExecute(result)
    }
}

===================================
error:
D/RootManager::Shell: Starting shell: su
D/RootManager::Shell: Starting shell: su
D/RootManager::Shell: Starting shell: su
D/RootManager::Shell: Starting shell: su
D/RootManager::Shell: Starting shell: su
D/RootManager: Could not start shell
W/System.err: java.io.IOException: Error running exec(). Command: [su] Working Directory: null Environment: null
W/System.err: at java.lang.ProcessManager.exec(ProcessManager.java:211)
W/System.err: at java.lang.Runtime.exec(Runtime.java:173)
W/System.err: at java.lang.Runtime.exec(Runtime.java:246)
W/System.err: at java.lang.Runtime.exec(Runtime.java:189)
W/System.err: at com.chrisplus.rootmanager.container.Shell.(Shell.java:75)
W/System.err: at com.chrisplus.rootmanager.container.Shell.startRootShell(Shell.java:135)
W/System.err: at com.chrisplus.rootmanager.container.Shell.startRootShell(Shell.java:121)
W/System.err: at com.chrisplus.rootmanager.utils.Remounter.remount(Remounter.java:93)
W/System.err: at com.chrisplus.rootmanager.RootManager.remount(RootManager.java:375)
W/System.err: at com.chrisplus.rootmanager.RootManager.uninstallSystemApp(RootManager.java:283)
W/System.err: at biz.mobileone.posmanagment.dashboard.MainActivity$someTask.doInBackground(MainActivity.kt:121)
W/System.err: at biz.mobileone.posmanagment.dashboard.MainActivity$someTask.doInBackground(MainActivity.kt:118)
W/System.err: at android.os.AsyncTask$2.call(AsyncTask.java:288)
W/System.err: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
W/System.err: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
W/System.err: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
W/System.err: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
W/System.err: at java.lang.Thread.run(Thread.java:818)
W/System.err: Caused by: java.io.IOException: Permission denied
W/System.err: at java.lang.ProcessManager.exec(Native Method)
W/System.err: at java.lang.ProcessManager.exec(ProcessManager.java:209)
W/System.err: ... 17 more
D/RootManager: Status Code is 409
I/System.out: Uninstall a855solution.gais.app false with the message Illegal Parameters or State

I see that the problem is in remount function and I think that this commit resolve it Stericson/RootTools@fa881ec

On the Lenovo Vibe A7010 (K4 Note) Android version 6.0.
Method rootManager.hasRooted() return false, but device has root.

Command pm uninstall "packageName" is not remove the system apps

i am tring to get Hash Value, but it always return me status code 0 and message is nothing.
Please check code below.'

 val hashValue: StringBuilder = StringBuilder()
        val hashCommand = RootManager.getInstance().runCommand("md5sum $path")
        hashValue.append("MD5 : ${hashCommand.message}")
        Log.d("getHash","Hash Message : "+hashCommand.message)
        Log.d("getHash","Hash Status Code : "+hashCommand.statusCode)
        Log.d("getHash","Hash Result : "+hashCommand.result)