to be subjected to discrimination in violation of section 303. Nothing in this section shall require a person with a disability to engage in a futile gesture if such person has actual notice that a person or organization covered by this title does not intend to comply with its provisions. (B) Barriers to access to existing public accommodations A civil action under section 302 or 303 based on the failure to remove an architectural barrier to access into an existing public accommodation may not be commenced by a person aggrieved by such failure unless— (i) that person has provided to the owner or operator of the accommodation a written notice specific enough to allow such owner or operator to identify the barrier