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POSharePoint 2010 - Receiving error attempting to use SPWebConfigModification
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  1. POSharePoint 2010 - Receiving error attempting to use SPWebConfigModification
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    copied!<p>I'm creating a SharePoint feature and within my <code>FeatureReceiver</code> I'm attempting to add a <code>SPWebConfigModification</code>. I've been following the approach outlined in <a href="http://weblogs.asp.net/wesleybakker/archive/2009/01/21/web.config-modifications-with-a-sharepoint-feature.aspx" rel="nofollow noreferrer">this</a> blog post.</p> <p>Here is a snippet from my feature receiver:</p> <pre><code>public override void FeatureActivated(SPFeatureReceiverProperties properties) { var webApp = (SPWebApplication)properties.Feature.Parent; var debugMode = new SPWebConfigModification { Path = "configuration/system.web/customErrors", Name = "mode", Value = "Off", Sequence = 0, Type = SPWebConfigModification.SPWebConfigModificationType.EnsureAttribute, Owner = "MyWebConfigMods" }; webApp.WebConfigModifications.Add(debugMode); // &lt;------ Error is thrown at this line webApp.WebService.ApplyWebConfigModifications(); webApp.Update(); } </code></pre> <p>Here is the stack trace from the error as seen in the SharePoint ULS viewer:</p> <pre><code>Feature receiver assembly 'MyCompany.SharePoint, Version=1.0.0.0, Culture=neutral, PublicKeyToken=xxxxxxxxxxxxxx', class 'MyCompany.SharePoint.Features.WebConfig.WebConfigFeatureReceiver', method 'FeatureActivated' for feature '3a07b91c-0968-4f14-b2bc-ae0e3f109cf9' threw an exception: System.Xml.XPath.XPathException: '' is an invalid expression. at MS.Internal.Xml.XPath.XPathScanner..ctor(String xpathExpr) at MS.Internal.Xml.XPath.XPathParser.ParseXPathExpresion(String xpathExpresion) at MS.Internal.Xml.XPath.QueryBuilder.Build(String query, Boolean allowVar, Boolean allowKey) at System.Xml.XPath.XPathExpression.Compile(String xpath, IXmlNamespaceResolver nsResolver) at System.Xml.XPath.XPathNavigator.Select(String xpath) at System.Xml.XmlNode.SelectSingleNode(String xpath) at Microsoft.SharePoint.Administration.SPWebConfigFileChanges.ApplyModificationsWebConfigXmlDocument(XmlDocument xdWebConfig, String filepath) at Microsoft.SharePoint.Administration.SPWebApplication.ApplyWebConfigModifications() at Microsoft.SharePoint.Administration.SPWebService.ApplyWebConfigModifications() at MyCompany.SharePoint.WebConfigModificationFeatureReceiver.FeatureActivated(SPFeatureReceiverProperties properties) at Microsoft.SharePoint.SPFeature.DoActivationCallout(Boolean fActivate, Boolean fForce) </code></pre> <p>Somewhere during the update an empty path is being referenced within an <code>XPath</code> expression. It's not in my feature. Any ideas?</p>
 

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