Event code: 3006 Event message: A parser error has occurred.

Log Name:      Application
Source:        ASP.NET 4.0.30319.0
Date:          26/06/2018 07:55:09
Event ID:      1310
Task Category: Web Event
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      %COMPUTERNAME%.domain.suffix
Description:
Event code: 3006
Event message: A parser error has occurred.
Event time: 26/06/2018 07:55:09
Event time (UTC): 26/06/2018 06:55:09
Event ID: fe45498915e14044b3df349c8dc3460d
Event sequence: 3
Event occurrence: 1
Event detail code: 0

Application information:
    Application domain: /LM/W3SVC/17/ROOT-1-131744697095283868
    Trust level: Full
    Application Virtual Path: /
    Application Path: E:\Websites\www\IT-Computer-Support.co.uk\
    Machine name: %COMPUTERNAME%

Process information:
    Process ID: 21096
    Process name: w3wp.exe
    Account name: IIS APPPOOL\Appname

Exception information:
    Exception type: HttpParseException
    Exception message: The directive contains duplicate 'metadescription' attributes.
   at System.Web.UI.TemplateParser.ParseString(String text, VirtualPath virtualPath, Encoding fileEncoding)
   at System.Web.UI.TemplateParser.ParseFile(String physicalPath, VirtualPath virtualPath)
   at System.Web.UI.TemplateParser.ParseInternal()
   at System.Web.UI.TemplateParser.Parse()
   at System.Web.Compilation.BaseTemplateBuildProvider.get_CodeCompilerType()
   at System.Web.Compilation.BuildProvider.GetCompilerTypeFromBuildProvider(BuildProvider buildProvider)
   at System.Web.Compilation.BuildProvidersCompiler.ProcessBuildProviders()
   at System.Web.Compilation.BuildProvidersCompiler.PerformBuild()
   at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath)
   at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
   at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
   at System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean throwIfNotFound)
   at System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp)
   at System.Web.UI.PageHandlerFactory.GetHandlerHelper(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath)
   at System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

The directive contains duplicate 'metadescription' attributes.
   at System.Web.UI.TemplateParser.ProcessError(String message)
   at System.Web.UI.TemplateParser.ProcessAttributes(String text, Match match, ParsedAttributeCollection& attribs, Boolean fDirective, String& duplicateAttribute)
   at System.Web.UI.TemplateParser.ParseStringInternal(String text, Encoding fileEncoding)
   at System.Web.UI.TemplateParser.ParseString(String text, VirtualPath virtualPath, Encoding fileEncoding)



Request information:
    Request URL: http://websiteaddress
    Request path: /website/path
    User host address: 54.36.149.84
    User:  
    Is authenticated: False
    Authentication Type:  
    Thread account name: IIS APPPOOL\IT-Computer-Support.co.uk

Thread information:
    Thread ID: 9
    Thread account name: IIS APPPOOL\IT-Computer-Support.co.uk
    Is impersonating: False
    Stack trace:    at System.Web.UI.TemplateParser.ParseString(String text, VirtualPath virtualPat

This was due to a meta description being in the page twice...