I've created topic negative for campaign criterion but when I mutated 
operation, I got error with message: Invalid path
My Code: 

def create_topic_operation(client,campaign_resource):


    campaign_criterion_operation_topic = 
client.get_type('CampaignCriterionOperation',
                                                          version='v2')
    campaign_criterion_topic = campaign_criterion_operation_topic.create
    campaign_criterion_topic.type = client.get_type('CriterionTypeEnum').TOPIC
    campaign_criterion_topic.campaign.value = campaign_resource
    campaign_criterion_topic.negative.value =True
    temp = ["Apparel & Accessories"]
    for item in temp :
        topic_path = campaign_criterion_topic.topic.path.add()
        topic_path.value = item.strip()

    return campaign_criterion_operation_topic

My Error:
 message: "Invalid topic path."
  trigger {
    string_value: "[Apparel & Accessories]"
  }
  location {
    field_path_elements {
      field_name: "operations"
      index {
        value: 14
      }
    }
    field_path_elements {
      field_name: "create"
    }
    field_path_elements {
      field_name: "topic"
    }
  }
}
Please help me! Thank you in advance

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