I need help with root element missing error

Server Error in '/' Application.
Root element is missing.
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.Xml.XmlException: Root element is missing.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[XmlException: Root element is missing.]
   System.Xml.XmlTextReaderImpl.Throw(Exception e) +72
   System.Xml.XmlTextReaderImpl.ParseDocumentContent() +5470471
   System.Xml.XmlTextReaderImpl.Read() +163
   System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace) +112
   System.Xml.XmlDocument.Load(XmlReader reader) +107
   System.Xml.XmlDocument.LoadXml(String xml) +160
   FabricsPlusCom.ShoppingCartCheckout.SendtoEWAY() +1551
   FabricsPlusCom.ShoppingCartCheckout.ShowStep(Int32 TheStep) +5245
   FabricsPlusCom.ShoppingCartCheckout.btnNext_Click(Object sender, EventArgs e) +79
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +9779798
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +204
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +12
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +15
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1639

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <system.web>
    <!--  DYNAMIC DEBUG COMPILATION
          Set compilation debug="true" to insert debugging symbols (.pdb information)
          into the compiled page. Because this creates a larger file that executes
          more slowly, you should set this value to true only when debugging and to
          false at all other times. For more information, refer to the documentation about
          debugging ASP.NET files.
    -->
	<compilation defaultLanguage="vb" debug="true" targetFramework="4.6" />
	<httpRuntime targetFramework="4.6" />
    <!--  CUSTOM ERROR MESSAGES
          Set customErrors mode="On" or "RemoteOnly" to enable custom error messages, "Off" to disable. 
          Add <error> tags for each of the errors you want to handle.
    -->
    <customErrors mode="Off" />
    <!--  AUTHENTICATION 
          This section sets the authentication policies of the application. Possible modes are "Windows", 
          "Forms", "Passport" and "None"
    -->
    <authentication mode="Forms">
      <forms loginUrl="/Admin/Login.aspx" />
    </authentication>
    <!--  AUTHORIZATION 
          This section sets the authorization policies of the application. You can allow or deny access
          to application resources by user or role. Wildcards: "*" mean everyone, "?" means anonymous 
          (unauthenticated) users.
    -->
    <authorization>
      <allow users="*" />
      <!-- Allow all users -->
      <!--  <allow     users="[comma separated list of users]"
                             roles="[comma separated list of roles]"/>
                  <deny      users="[comma separated list of users]"
                             roles="[comma separated list of roles]"/>
            -->
    </authorization>
    <!--  APPLICATION-LEVEL TRACE LOGGING
          Application-level tracing enables trace log output for every page within an application. 
          Set trace enabled="true" to enable application trace logging.  If pageOutput="true", the
          trace information will be displayed at the bottom of each page.  Otherwise, you can view the 
          application trace log by browsing the "trace.axd" page from your web application
          root. 
    -->
    <trace enabled="false" requestLimit="10" pageOutput="false" traceMode="SortByTime" localOnly="true" />
    <!--  SESSION STATE SETTINGS
          By default ASP.NET uses cookies to identify which requests belong to a particular session. 
          If cookies are not available, a session can be tracked by adding a session identifier to the URL. 
          To disable cookies, set sessionState cookieless="true".
    -->
    <sessionState
      mode="InProc"
      cookieless="false" 
      timeout="60"
    />    
    <!--  GLOBALIZATION
          This section sets the globalization settings of the application. 
	Provider=Microsoft.Jet.OLEDB.4.0;Data Source=;Persist Security Info=False
	D:\vhosts\fabricsplus.com.au\httpdocs\ASP\FPDB\dbFabricsPlus.mdb
	Changed Text
    -->
    <globalization requestEncoding="utf-8" responseEncoding="utf-8" />
   <!--  <identity impersonate="true"/> --> 
	<!--
	<machineKey validationKey="50F768F66ED5CCA46CBF28C382D95C6BCD7BC696A74B47DCC17928736541DF95A7C94EAF4147D6F7B3C2BB44286FB99B54A7F71C77854ABEEF19252265216FB9" decryptionKey="8D97CB08D9D841D496615A7DB34C01F86E3256CB54734F9FC693B648B14333B5" validation="SHA1" decryption="AES" />
	-->
  </system.web>
  <system.net>
    <mailSettings>
      <smtp from="sales@fabricsplus.com.au">
        <network
          host="mail.fabricsplus.com.au"
          port="25"
	  userName="sales@fabricsplus.com.au"
	  password="Pedro1"
        />
      </smtp>
    </mailSettings>
  </system.net>
  <appSettings>
    <!--   User application and configured property settings go here.-->
    <!--   Example: <add key="settingName" value="settingValue"/> -->
    <add key="connDB.ConnectionString" value="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\vhosts\fabricsplus.com.au\httpdocs\ASP\FPDB\dbFabricsPlus.mdb;Persist Security Info=False" />
  </appSettings>
</configuration>