引导验证中的文件扩展名

我正在这里验证添加的Docx扩展名,但是当我选择Docx文件时仍然显示一个错误。有人能提出这里的问题吗

upload: {
           validators: {
              file: {
                 extension: 'doc,docx,pdf,zip,rtf',
                 type: 'application/pdf,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document,application/rtf,application/zip',
                 maxSize: 5*1024*1024,   // 5 MB
                 message: 'The selected file is not valid, it should be (doc,docx,pdf,zip,rtf) and 5 MB at maximum.'
              }
           }
        },