when scrapy crawls a picture of a web page, the class that inherits ImagesPipelines is customized in the pipelines file.
but the custom pipelines cannot be executed after running the program. Item cannot pass

the following is a custom pipelines

class Douyu3Pipeline(ImagesPipeline):
    -sharp def process_item(self, item, spider):
    -sharp     return item

    IMAGES_STORE = get_project_settings().get("IMAGE_STORE")

    def get_media_requests(self, item, info):
        print("1---------------------------1")
        image_url = item["imagelink"]
        yield scrapy.Request(image_url)

    def item_completed(self, results, item, info):
        image_path = [x["path"] for ok, x in results if ok]
        os.rename(self.IMAGES_STORE + "/" + image_path[0],
                  self.IMAGES_STORE + "/" + item["nickname"] + ".jpg")
        item["imagePath"] = self.IMAGES_STORE + "/" + item["nickname"]
        return item

settings file settings are as follows:

BOT_NAME = "douyu3"

SPIDER_MODULES = ["douyu3.spiders"]
NEWSPIDER_MODULE = "douyu3.spiders"


ROBOTSTXT_OBEY = True


-sharp Override the default request headers:
DEFAULT_REQUEST_HEADERS = {
    "User-Agent": "DYZB/1 CFNetwork/808.2.16 Darwin/16.3.0",
}


ITEM_PIPELINES = {
   "douyu3.pipelines.Douyu3Pipeline": 300,
}

IMAGE_STORE = "/Users/enritami/desktop/SearchEngineer/douyu3/Images"

print exception as follows:

exception is: Enable item pipelines: [] custom pipelines cannot be added to the pipe list