GRE 送分遇到问题，付款网页出错问题

今天GRE增送，但是到最后Payment Details页面点了processed to chackout之后，出现一个HTTP Status 500 错误，
具体如下：
HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.tapestry5.internal.services.RenderQueueException: Render queue error in BeginRender[ExceptionReport:paymentlayout]: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Cannot open connection [at context:ExceptionReport.tml, line 1]
org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:84)
org.apache.tapestry5.internal.services.PageRenderQueueImpl.render(PageRenderQueueImpl.java:127)
$PageRenderQueue_14280b2ba10.render($PageRenderQueue_14280b2ba10.java)
$PageRenderQueue_14280b2ba0f.render($PageRenderQueue_14280b2ba0f.java)
org.apache.tapestry5.internal.services.MarkupRendererTerminator.renderMarkup(MarkupRendererTerminator.java:37)
org.apache.tapestry5.services.TapestryModule$29.renderMarkup(TapestryModule.java:2089)
$MarkupRenderer_14280b2ba12.renderMarkup($MarkupRenderer_14280b2ba12.java)
org.apache.tapestry5.services.TapestryModule$28.renderMarkup(TapestryModule.java:2073)
。。。。。。
。。。。。。

有没有人遇到过？求助各位大神！！