Unhandled Promise rejection: Cannot assign to a reference or variable! ; Zone: ; Task: Promise.then ; Value: Error: Cannot assign to a reference or variable!

@BenImad wrote:

Please!
Someone can help me?
I am a beginner in ionic 3 and I started to learn with a project I'm working on right now.
Since this morning, I opened my project and I block on this message of error for which I do not understand abolutely nothing.
In this error message it says "polyfills.js", yet I did not touch anything.

And when I do " ionic serve --l " it only displays a blank page with nothing as information.

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