'Instance member 'showToast' can't be accessed using static access

I have been trying to add a toast message by following the youtube tutorial https://www.youtube.com/watch?v=o2tq4RMcAJw However, it keeps on giving me the error

Instance member 'showToast' can't be accessed using static access.

Where I am going wrong?

flutter instance toast

Solution 1:^[1]

try type flutter pub add fluttertoast and flutter pub get. close and open your editor, try run again

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Solution	Source
Solution 1	anggadaz