Why does controller gives: System.NullPointerException: Attempt to de-reference a null object?

Why does controller gives: System.NullPointerException: Attempt to de-reference a null object?

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Test Classes are giving me 'System.NullPointerException: Attempt to de-reference a null object'...
Test Classes are giving me 'System.NullPointerException: Attempt to de-reference a null object'...
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Test Classes are giving me 'System.NullPointerException: Attempt to de-reference a null object'...

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