原填写的D160表格，今天为何无法调出资料继续填写

5月底填写的D160表格，6月初有调出续填过， 今天为何无法调出资料继续填写呢？输入编码后，网站显示如下：
Application ErrorAn unexpected error has occurred while processing your previous request. The error has been reported to the site administrator; no further action is required. To retrieve your DS-160 application, please enter your Application ID.
Please correct all areas in error as indicated below. Once you have finished, click ‘Retrieve Application’ button to continue completing your online application form.

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望有经验的童鞋给予指导，谢谢。