For the last 2 days I have been getting an error.
I get this error when I try to use the Udutu Moodle application, it was working PERFECTLY before. I also get it when I go in to preview live. And right now as I was working on a course all of a sudden when I click on any of the screens in the tree the error comes up in the main frame of the building interface.
Server Error in '/myudutu' Application.
Validation
of viewstate MAC failed. If this application is hosted by a Web Farm or
cluster, ensure that <machineKey> configuration specifies the
same validationKey and validation algorithm. AutoGenerate cannot be
used in a cluster.
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.Web.HttpException:
Validation of viewstate MAC failed. If this application is hosted by a
Web Farm or cluster, ensure that <machineKey> configuration
specifies the same validationKey and validation algorithm. AutoGenerate
cannot be used in a cluster.
Source Error:
[No relevant source lines]
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Source File: c:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\myudutu\c8457e63\15816c9b\App_Web_wdfdqvlh.6.cs Line: 0
Stack Trace:
[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +10982901
System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +295
[ViewStateException: Invalid viewstate.
Client IP: 98.239.81.19
Port: 43770
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.0.13) Gecko/2009073021 Firefox/3.0.13
ViewState: 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...]
[HttpException (0x80004005): Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster.]
System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +148
System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +10956181
System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState) +59
System.Web.UI.HiddenFieldPageStatePersister.Load() +10956280
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +11040040
System.Web.UI.Page.LoadAllState() +46
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +11035559
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +11035098
System.Web.UI.Page.ProcessRequest() +91
System.Web.UI.Page.ProcessRequest(HttpContext context) +240
ASP.moodlepay_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework64\v2.0.50727\Temporary ASP.NET Files\myudutu\c8457e63\15816c9b\App_Web_wdfdqvlh.6.cs:0
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +599
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +171
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Version Information: Microsoft .NET Framework Version:2.0.50727.3074; ASP.NET Version:2.0.50727.3074