Today when we were setting up an old EPiServer 5.1 SP1 site we got some strange errors so I turned on the logging in EPiServer. I got everything to work except for the composer edit on page where I recived the error below.

After doing some debuggning with Reflector Pro inside the EPiServer assembly I realised that it was when EPiServer.Web.PermanentLinUtility.GetPageReference(UrlBuilder mappedUrl) was trying to do some logging it failed. The first thing that this method does is to check for some logging settings and then do some logging.

if (_log.IsInfoEnabled)
{
    _log.InfoFormat("ReparsePageUrl for Url = {0}", (mappedUrl == null) ? "(NULL)" :  mappedUrl.ToString());
}

The part which fails is mappedUrl.ToString().

I haven't bothered to analyze why the ToString() fails. I just turned down the logging so that it won't log that.
If anyone has an idea why it's failing, please comment.

Server Error in '/' Application.   


Invalid URI: There is an invalid sequence in the  string.
   Description: An unhandled exception occurred during  the execution of the current web request. Please review the stack trace  for more information about the error and where it originated in the  code.              

  Exception Details: System.UriFormatException:  Invalid URI: There is an invalid sequence in the string.

 Source Error: 

 



 An unhandled exception was generated during the execution of the current  web request. Information regarding the origin and location of the  exception can be identified using the exception stack trace below.




 Stack Trace: 

 




[UriFormatException: Invalid URI: There is an invalid sequence in the string.]
   System.Uri.UnescapeString(Char* pStr, Int32 start, Int32 end, Char[] dest, Int32& destPosition, Char rsvd1, Char rsvd2, Char rsvd3, UnescapeMode unescapeMode, UriParser syntax, Boolean isQuery, Boolean readOnlyConfig) +1332
   System.Uri.UnescapeString(String input, Int32 start, Int32 end, Char[] dest, Int32& destPosition, Char rsvd1, Char rsvd2, Char rsvd3, UnescapeMode unescapeMode, UriParser syntax, Boolean isQuery, Boolean readOnlyConfig) +73
   System.Uri.UnescapeDataString(String stringToUnescape) +152
   EPiServer.UrlBuilder.ToString() +15
   EPiServer.Web.PermanentLinkUtility.GetPageReference(UrlBuilder mappedUrl) +48
   EPiServer.Web.FriendlyHtmlRewriteToExternal.HtmlRewriteUrl(UrlBuilder internalUrl, UrlBuilder externalUrl, UrlBuilder url, Encoding encoding, Object& internalObject) +15
   EPiServer.Web.FriendlyHtmlRewriteToExternal.rewritePipe_HtmlRewriteUrl(Object sender, HtmlRewriteEventArgs e) +274
   EPiServer.Web.RewritePipe.OnHtmlRewriteUrl(HtmlRewriteEventArgs e) +19
   EPiServer.Web.HtmlRewritePipe.WriteElement(MyHtmlRewriteEventArgs e, SgmlReader reader, TextWriter writer) +394
   EPiServer.Web.HtmlRewritePipe.RewriteToEnd(TextReader reader, TextWriter writer) +2008
   EPiServer.Web.HtmlRewriteStream.Close() +165
   System.Web.HttpWriter.FilterIntegrated(Boolean finalFiltering, IIS7WorkerRequest wr) +497
   System.Web.HttpResponse.FilterOutput() +119
   System.Web.CallFilterExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +47
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75






 

Version Information: Microsoft .NET Framework  Version:2.0.50727.4927; ASP.NET Version:2.0.50727.4927