使用FilePick上传uri失败，报错201

import { image } from '@kit.ImageKit'; 
import { picker, fileIo } from '@kit.CoreFileKit'; 
import { BusinessError } from '@kit.BasicServicesKit'; 
 
@Entry 
@Component 
struct PixelMapToPhotoPage { 
  @State message: string = '选择图片并解析'; 
  @State text: string = ''; 
  private url: string | null = null; 
  onPageShow() { 
    if (!this.url) { 
      let pp = new picker.PhotoSelectOptions(); 
      pp.MIMEType = picker.PhotoViewMIMETypes.IMAGE_TYPE; 
      pp.maxSelectNumber = 1; 
      let photoPicker = new picker.PhotoViewPicker(); 
      photoPicker.select(pp).then((selectResult) => { 
        this.url = selectResult.photoUris[0]; 
        console.info("AAAAAA ****** select photo success : " + this.url) 
      }).catch((err: BusinessError) => { 
        console.info("AAAAAA ****** error is : " + err) 
      }) 
    } 
  } 
  selectPhotoAndSave(url: string | null) { 
    if (this.url) { 
      let file = fileIo.openSync(url, fileIo.OpenMode.READ_ONLY); 
      let source = image.createImageSource(file.fd); 
      source.createPixelMap().then((pixelMap) => { 
        this.text = "图片大小为：" + pixelMap.getPixelBytesNumber() + "B"; 
      }) 
    } else { 
      console.info("AAAAAA ****** url is null") 
    } 
  } 
  build() { 
    Row() { 
      Column() { 
        Text(this.message) 
          .fontSize(20) 
          .fontWeight(FontWeight.Bold) 
        Button("图片解析") 
          .fontSize(20) 
          .margin({ top: 10 }) 
          .onClick(() => { 
            this.selectPhotoAndSave(this.url); 
          }) 
        Text(this.text) 
          .fontSize(20) 
          .width(200) 
          .height(200) 
          .borderWidth(1) 
          .borderRadius(15) 
          .margin({ top: 10 }) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}