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HomeHomeUsing DNN Platf...Using DNN Platf...Administration ...Administration ...sequence contains more than one matching elementsequence contains more than one matching element
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9/3/2015 4:01 PM
 

An entire site is down with this error. DNN 6.x - don't have the specific version number at hand.

Sequence contains more than one matching element

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.InvalidOperationException: Sequence contains more than one matching element

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: 

[InvalidOperationException: Sequence contains more than one matching element]
   System.Linq.Enumerable.SingleOrDefault(IEnumerable`1 source, Func`2 predicate) +2589154
   DotNetNuke.HttpModules.Membership.MembershipModule.AuthenticateRequest(HttpContextBase context, Boolean allowUnknownExtensinons) +609
   DotNetNuke.HttpModules.Membership.MembershipModule.OnAuthenticateRequest(Object sender, EventArgs e) +77
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +136
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69

 

I read another thread with a similar error and it suggested an IIS app pool refresh might help (unable to try that at the moment) and that there's probably a duplicate entry in the database. Suggestions on the best way to troubleshoot and fix this error? Thanks!

 
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9/3/2015 7:03 PM
 
re-saving web.config file (with no changes) should restart your application.

Cheers from Germany,
Sebastian Leupold (Microsoft MVP)

dnnWerk - The DotNetNuke Experts   German Spoken DotNetNuke User Group

Speed up your DNN Websites with TurboDNN
 
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9/3/2015 7:26 PM
 

Thanks - that got the site running again. DNN version is 6.02.00. Any thoughts on what may have generated that error? Haven't had that happen before and would like to prevent it in the future if possible.

 
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9/4/2015 3:47 AM
 
unfortunately, the error message doesn't contain enough details to identify the cause of the problem.
You may try getting full error message from the eventlog.

Cheers from Germany,
Sebastian Leupold (Microsoft MVP)

dnnWerk - The DotNetNuke Experts   German Spoken DotNetNuke User Group

Speed up your DNN Websites with TurboDNN
 
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