How To Fix Error: Method 'validate' cannot be called on 'FormState?' because it is potentially null.

How To Fix Error: Method 'validate' cannot be called on 'FormState?' because it is potentially null.

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How To Fix Error: Method 'validate' cannot be called on 'FormState?' because it is potentially null.
How To Fix Error: Method 'validate' cannot be called on 'FormState?' because it is potentially null.
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