Confirm JS cannot open third webpage in Customwebview

MIT App Inventor Help
1

Please, i am finding it difficult to load the third webpage in custom webview.
The error apper from customwebview.OnJSAlert.
here is the error received

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image1456×554 53.5 KB

2

The method ConfirmJs takes a boolean, not an integer.

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image698×156 2.73 KB

3

Please can you show me example of Boolean expression

4

True and False are the only two Boolean values.

(since App Inventor is made with Java)

5

Thank you I appreciate.
But the third webpage I want to load from custom webview is not loading.
Using the block I showed up, can you help me with likely solutions.

Regards