UPDATE: FIXED

The error description starts with:

...
Failed to pull the backend.
Unexpected token 'export'
C:========================\src\aws-exports.js:36
export default awsmobile;
^^^^^^
SyntaxError: Unexpected token 'export'
...

The problem could be, the app is looking for aws-exports.TS, instead of the JS version

Changed it worked for me.

Update2: After re-installing AmplifyCLI, it works again