尝试使用Fineuploader上传PDF文件时。它通过一个未知的错误异常

Question

我正在使用fineuploader为我的联系表单上传图片和pdf文件。但是当我尝试上传pdf文件时，即使我将pdf扩展添加到allowedExtensions数组，也会导致未知的错误异常。 图片上传没有问题。

这是我的配置代码：

var DEFAULT_CONFIG = {
  autoUpload: true,
  cors: {
    expected: true,
  },
  maxConnections: 2,
  element: document.getElementById('fine-uploader'),
  request: {
    endpoint: SERVICE_ENDPOINT,
    forceMultipart: false,
    params: SERVICE_PARAMS,
  },
  validation: {
    sizeLimit: 1024 * 1024 * 50,
    allowedExtensions:["bmp","gif","jpg","jpeg",
                       "pcx","png","tga","tiff", "tif", "doc", "docx", "pdf"],
  },
  workarounds: {
    iosEmptyVideos: false,
  }
};