How catch erro on ios simulator blank page?

I recreating my ionic5 app on new macbook but I have issue to build my app.
When I start app on ios simulator, I receive blank page and no error shown into xcode console and samari developer tool print only a strance missing file:

[Error] Failed to load resource: The requested URL was not found on this server. 
(toSubscriber.js.map, line 0)

How can I debug my app and catch the error?

Thanks

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