调用imageSource.createPixelMap()报错“Create PixelMap error”

import { BusinessError } from '@ohos.base'; 
import { image } from '@kit.ImageKit'; 
 
let decodingOptions: image.DecodingOptions = { 
  editable: true, 
  desiredPixelFormat: 3, 
  desiredSize: { width: 4, height: 6 } 
} 
const context: Context = getContext(this); 
const filePath: string = context.cacheDir + '/test.jpg'; 
const imageSource: image.ImageSource = image.createImageSource(filePath); 
// 创建pixelMap并进行简单的旋转和缩放 
imageSource.createPixelMap(decodingOptions).then((pixelMap: image.PixelMap) => { 
  console.log("Succeeded in creating PixelMap") 
}).catch((err: BusinessError) => { 
  console.error("Failed to create PixelMap") 
});