Gettingsthis error when trying to validate: array_map(): Argument #2 ($array) must be of type array, bool given

I'm getting an error here:

// error
                'address' => ['required'],

                'educational_attainment' => ['required', Rule::in(array_keys(SeniorCitizen::$educational_attainments))],

                'occupation' => ['required'],

                'annual_income' => ['required', 'numeric', 'gte:0'],

                'other_skills' => ['nullable'],

 

                // member

                'name_of_association' => ['nullable'],

                'address_of_association' > ['required_with:name_of_association'],

                'date_of_membership' => ['required_with:name_of_association'],

                'date_elected' => ['nullable'],

                'term' => ['required_with:date_elected']

 

            ],

            [

               'date_of_birth.before' => 'The date of birth must more than 60+ years ago today.', // error here

            ]

        );

// my code
        $dt = new Carbon();
        $before = $dt->subYears(60)->format('Y-m-d');

        $validator = Validator::make(
            $request->all(),
            [
                // personal information
                'lastname' => ['required'],
                'firstname' => ['required'],
                'middlename' => ['nullable'],

                // picture
                'picture' => ['required', 'image'],

                // personal information
                'date_of_birth' => ['required', 'date', "before_or_equal:{$before}"],
                'sex' => ['required', 'in:male,female'],
                'place_of_birth' => ['required'],
                'civil_status' => ['required', Rule::in(SeniorCitizen::$civil_statuses)],
                'address' => ['required'],
                'educational_attainment' => ['required', Rule::in(array_keys(SeniorCitizen::$educational_attainments))],
                'occupation' => ['required'],
                'annual_income' => ['required', 'numeric', 'gte:0'],
                'other_skills' => ['nullable'],

                // member   
                'name_of_association' => ['nullable'],
                'address_of_association' > ['required_with:name_of_association'],
                'date_of_membership' => ['required_with:name_of_association'],
                'date_elected' => ['nullable', 'required_with:name_of_association'],
                'term' => ['required_with:date_elected']

            ],
            [
                'date_of_birth.before' => 'The date of birth must more than 60+ years ago today.',
            ]
        );

I'm trying to make name_of_association to be nullable, but when not empty, address_of_association and date_of_membership will be required. Then, date_elected can be nullable as well either way, but should only be filled when name_of_association is not empty.

The whole validation was working before, until I added those validations under // member comment.