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A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 191

Backtrace:

File: /home/prodcxja/public_html/questions/application/views/question.php
Line: 191
Function: _error_handler

File: /home/prodcxja/public_html/questions/application/controllers/Questions.php
Line: 433
Function: view

File: /home/prodcxja/public_html/questions/index.php
Line: 315
Function: require_once

I have a spinner that allows me to select a particular text. I am creating a second spinner programmatically and putting (in it) differents arrays of string elements depending on the choice made in a switch activated when selecting something from the first spinner. The second spinner is inside a LinearLayout. When I select one choice from the first spinner for the first time, everything is ok, when I select another choice everything crashes. Could you help me in detecting what makes this to happen?

    final String[] as = {"AB", "AC", "AD", "AE", "AF", "AG","AH"};
    final String[] bs = {"BC", "BD", "BE", "BF", "BG", "BH", "BI"};

Inside the onCreate method

    //second Spinner
    second_layout = findViewById(R.id.second_spinner);
    spinner_2 = new Spinner(this);

The Switch

    @Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    String comb_selected = String.valueOf(spinner_1.getSelectedItem());

    switch (comb_selected){
        case "As"                
            second_layout.setVisibility(View.VISIBLE);
            fillSecondSpinner(as);
            break;
        case "Bs":                
            second_layout.setVisibility(View.VISIBLE);
            fillSecondSpinner(bs);
            break;
        default:
            flag.setVisibility(View.INVISIBLE);
            second_layout.setVisibility(View.INVISIBLE);
            break;

The function that makes everything crash

    public void fillSecondSpinner(String[] combinations){
    ArrayAdapter<CharSequence> adapter_comb = new ArrayAdapter(this, android.R.layout.simple_spinner_item, combinations);
    adapter_comb.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner_2.setAdapter(adapter_villes);
    second_layout.addView(spinner_2);
}

This is the error I get:

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.exercice1.spinner2, PID: 2304
    java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
        at android.view.ViewGroup.addViewInner(ViewGroup.java:4417)
        at android.view.ViewGroup.addView(ViewGroup.java:4258)
        at android.view.ViewGroup.addView(ViewGroup.java:4198)
        at android.view.ViewGroup.addView(ViewGroup.java:4171)
        at com.exercice1.spinner2.MainActivity.fillSecondSpinner(MainActivity.java:49)
        at com.exercice1.spinner2.MainActivity.onItemSelected(MainActivity.java:68)
        at android.widget.AdapterView.fireOnSelected(AdapterView.java:931)
        at android.widget.AdapterView.dispatchOnItemSelected(AdapterView.java:920)
        at android.widget.AdapterView.-wrap1(AdapterView.java)
        at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:890)
        at android.os.Handler.handleCallback(Handler.java:751)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6119)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Application terminated.