Error paying for ad removal

[Mark W. Kidd]

I just tried to pay for ad removal credits. Here's the error message I received:

Error 500

ad-free payment failed: bad status

Message: ad-free payment failed: bad status

RequestURI: /template/NamlServlet.jtp

Server: n6.nabble.com
Caused by:

fschmidt.util.servlet.JtpContextServlet$JtpServletException: url=http://link.appalachiancommunities.org/template/NamlServlet.jtp?macro=ad_free_payment_page&transactionId=16TOVJ9KJ1IFMKJBQSZMQ5P3ZF1IR4CHOPD&transactionDate=1337647015&signatureVersion=2&signatureMethod=RSA-SHA1&status=PF&buyerEmail=mark%40stardart.net&operation=pay&transactionAmount=USD+5&recipientEmail=support_paid%40nabble.com&buyerName=Mark+W+Kidd&recipientName=Nabble+LLC&paymentMethod=Credit+Card&certificateUrl=https%3A%2F%2Ffps.amazonaws.com%2Fcerts%2F090911%2FPKICert.pem%3FrequestId%3D3kvrrq202clk0d2kbzik6ymfmr9s0w2pij3l&paymentReason=10%2C000+ad-free+credits+for+http%3A%2F%2Flink.appalachiancommunities.org  user-agent=Mozilla/5.0 (Windows NT 5.1; rv:12.0) Gecko/20100101 Firefox/12.0 method=GET referer=null
        at fschmidt.util.servlet.JtpContextServlet.handleException(JtpContextServlet.java:571)
        at fschmidt.util.servlet.JtpContextServlet.service2(JtpContextServlet.java:465)
        at fschmidt.util.servlet.JtpContextServlet.service(JtpContextServlet.java:332)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:565)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1360)
        at org.eclipse.jetty.servlets.UserAgentFilter.doFilter(UserAgentFilter.java:77)
        at org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:144)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1331)
        at cachingfilter.CachingFilter.doFilter(CachingFilter.java:133)
        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.j