SqlSiteMapProvider ConnectionStrings Help!

When I run my project it fails on SqlDependency.Start(_connect) with message:

An attempt to attach an auto-named database for file D:WINDOWSMicrosoft.NETFrameworkv2.0.50727ASPNETDB.MDF failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.

 

<?xml version="1.0"?>

<configuration>
 <appSettings/>
 <connectionStrings>
 
  <add name="SiteMapConnectionString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory| est1.mdf;Integrated Security=True"
   providerName="System.Data.SqlClient" />
 </connectionStrings>
 <system.web>
  
  <siteMap enabled="true" defaultProvider="AspNetSqlSiteMapProvider">
   <providers>
    <add name="AspNetSqlSiteMapProvider" type="SqlSiteMapProvider" securityTrimmingEnabled="true" connectionStringName="SiteMapConnectionString" sqlCacheDependency="CommandNotification"/>
   </providers>
  </siteMap>
  <caching>
   <sqlCacheDependency enabled="true"/>
  </caching>
  <compilation debug="true" strict="false" explicit="true"/>
  <pages>
   <namespaces>
    <clear/>
    <add namespace="System"/>
    <add namespace="System.Collections"/>
    <add namespace="System.Collections.Specialized"/>
    <add namespace="System.Configuration"/>
    <add namespace="System.Text"/>
    <add namespace="System.Text.RegularExpressions"/>
    <add namespace="System.Web"/>
    <add namespace="System.Web.Caching"/>
    <add namespace="System.Web.SessionState"/>
    <add namespace="System.Web.Security"/>
    <add namespace="System.Web.Profile"/>
    <add namespace="System.Web.UI"/>
    <add namespace="System.Web.UI.WebControls"/>
    <add namespace="System.Web.UI.WebControls.WebParts"/>
    <add namespace="System.Web.UI.HtmlControls"/>
   </namespaces>
  </pages>

  <authentication mode="Windows"/>
  
 </system.web>
</configuration>