Custom Widget with File Picker ( for API )

Im having a problem with File Upload which is the most important part of my app.. I m trying to implement File Picker. But no luck. I had a go with another package just to try and see and it all worked but with File Picker im having a problem. Target of Uri doesnt exist.. https://pub.dev/packages/file_picker is the package im trying to add anyone had a go with this package ?? thanks alot[Screen Shot 2022-03-25 at 6.16.54 pm.png]

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