WiX install error 2762 while invoking a CustomActi

I am a beginner, started learning WiX. I want to capture and validate and register user details during the installation process. I have created a dialog to capture user registration and invoking a custom action once user clicks on 'Next'.

But here I am getting installer error 2762. Though the error description says that "The action must be scheduled between InstallInitialize and InstallFinalize", I am not able to figure out how to resolve this problem.

Here is my XML script:

<Binary Id="mycustom"
        SourceFile="..\CustomAction1\bin\Debug\CustomAction1.CA.dll" />

<CustomAction Id="myCustomValidate"
              BinaryKey="mycustom"
              DllEntry="ValidateCustomAction"
              Execute="deferred"
              Return="check">
</CustomAction>

<UI>
    <UIRef Id="WixUI_Mondo" />
    <Dialog Id="UserRegistrationDlg"
            Width="370"
            Height="270"
            Title="[ProductName] [Setup]"
            NoMinimize="yes">
        ..
        ..
        ..
        <Control Id="Next"
                 Type="PushButton"
                 X="236"
                 Y="243"
                 Width="56"
                 Height="17"
                 Default="yes"
                 Text="[ButtonText_Next]">
            <Publish Event="ValidateProductID" Value="0">1</Publish>
            <Publish Event="DoAction" Value="myCustomValidate">1</Publish>
            <Publish Event="SpawnDialog" Value="InvalidRegDlg">PIDACCEPTED = "0"</Publish>
            <Publish Event="NewDialog" Value="SetupTypeDlg">ProductID AND PIDACCEPTED = "1"</Publish>
        </Control>
    </Dialog>
</UI>

Following is the custom action code I used.

[CustomAction]
public static ActionResult ValidateCustomAction(Session session)
{
    return ActionResult.Success;
}

Custom action is working fine if used in "InstallExecuteSequence". I am not able to figure out the problem, I removed the custom dialog and used the following simple call to invoke custom action. But I ended up with the same error.

<Publish Dialog="LicenseAgreementDlg"
         Control="Next"
         Event="DoAction"
         Value="myCustomValidate">1</Publish>

I am sure I am doing something silly here, but couldn't figure out. What is the solution?

In your CustomAction element set Execute attribute to immediate. Deferred actions can run only in InstallExecuteSequence between InstallInitialize and InstallFinalize actions.