Server Error in '/' 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.

See http://go.microsoft.com/fwlink/?LinkID=314055 for more information.

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.

See http://go.microsoft.com/fwlink/?LinkID=314055 for more information.

Source Error:


[No relevant source lines]

Source File: c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\7ade0c6a\8bb4e30\App_Web_fhoeuuke.22.cs    Line: 0

Stack Trace:


[ViewStateException: Invalid viewstate. 
	Client IP: 91.76.255.80
	Port: 54289
	Referer: https://avccoins.com/contactus.html
	Path: /contactus.aspx
	User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36
	ViewState: /wEPDwUKLTE1NjU5NDQxOQ8WAh4TVmFsaWRhdGVSZXF1ZXN0TW9kZQIBFgJmD2QWBGYPZBYGAgMPFgIeBGhyZWYFDy9DU1MvQ29tbW9uLmNzc2QCBA8WAh8BBRkvSlNjcmlwdC9mdWxsY2FsZW5kYXIuY3NzZAIFDxYCHwEFDi9DU1MvU3R5bGUuY3NzZAIBD2QWFAIBDw8WAh4LTmF2aWdhdGVVcmwFAS9kZAIDDw8WAh4EVGV4dGVkZAIFDw8WAh4HVmlzaWJsZWhkZAIHDzwrAAkBAA8WBB4IRGF0YUtleXMWAB4LXyFJdGVtQ291bnQCAmQWBGYPZBYCAgEPZBYCZg9kFgICAQ8PFgQfAwUSRXhpc3RpbmcgQ3VzdG9tZXJzHwIFCy9Mb2dpbi5odG1sZGQCAQ9kFgICAQ9kFgJmD2QWAgIBDw8WBB8DBQ1OZXcgQ3VzdG9tZXJzHwIFDC9TaWduVXAuaHRtbGRkAgsPDxYCHwIFDi9FZGl0Q2FydC5odG1sZGQCDQ8PFgIfAwUHMCBJdGVtc2RkAg8PD2QWAh4Kb25rZXlwcmVzcwVpIGlmICggd2luZG93LmV2ZW50LmtleUNvZGU9PTEzICkgeyBkb2N1bWVudC5nZXRFbGVtZW50QnlJZCgnY3RsMDBfSW1nU2VhcmNoJykuY2xpY2soKTsgcmV0dXJuIGZhbHNlIDsgfSAgZAITDzwrAAkBAA8WBB8FFgAfBgIFZBYKZg9kFgICAQ8WCB4FY2x...]

[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.

See http://go.microsoft.com/fwlink/?LinkID=314055 for more information.]
   System.Web.UI.ViewStateException.ThrowError(Exception inner, String persistedState, String errorPageMessage, Boolean macValidationError) +153
   System.Web.UI.ObjectStateFormatter.Deserialize(String inputString, Purpose purpose) +896
   System.Web.UI.Util.DeserializeWithAssert(IStateFormatter2 formatter, String serializedState, Purpose purpose) +61
   System.Web.UI.HiddenFieldPageStatePersister.Load() +305
   System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +367
   System.Web.UI.Page.LoadAllState() +46
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +9458
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +345
   System.Web.UI.Page.ProcessRequest() +75
   System.Web.UI.Page.ProcessRequest(HttpContext context) +70
   ASP.contactus_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\7ade0c6a\8bb4e30\App_Web_fhoeuuke.22.cs:0
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +790
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +195
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +88


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3770.0
Coins - Packaging - Protective Coin Tube - Quarter - Qty 25
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