Publishing my webapp gives me an error that i don't know how to resolve.

Question

The error I get is:

Transformed Web.config using D:\OneDrive\Desktop\Website\Web.Debug.config into C:\Users\chetr\AppData\Local\Temp\WebSitePublish\Website-850341849\obj\Debug\TransformWebConfig\transformed\Web.config.

C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\MSBuild\Microsoft\VisualStudio\v15.0\Web\Microsoft.Web.Publishing.targets(2311,5): Error : Object reference not set to an instance of an object.

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Because this error appears to be related to me Web.config file, I've added it below.

My web.config file is as follows:

?xml version="1.0"?>
<configuration>
  <configSections>
    <sectionGroup name="businessObjects">
      <sectionGroup name="crystalReports">
        <section name="rptBuildProvider"
          type="CrystalDecisions.Shared.RptBuildProviderHandler, CrystalDecisions.Shared, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304, Custom=null"/>
      </sectionGroup>
    </sectionGroup>
  </configSections>
  <appSettings>
    <!-- 
            RichTextEditor.NET provides added layer of security by
            Encrypting vital QueryString. You can set your password
            by setting the below value.
      -->
    <add key="rteCryptoKey" value="t%B*7jM+"/>
    <!-- 
      For Full / Licensed version of RichTextEditor.NET set LicenseKey provided with you order.  
    -->
    <add key="rteLicenseKey" value="EVP7TK-FDA7BT-4GPFT4-EOPPRY-D2KG6"/>
  </appSettings>
  <connectionStrings>
    <add name="ConnectionString" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\InvData.mdb;Persist Security Info=True"
      providerName="System.Data.OleDb"/>
    <add name="conn" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\InvData.mdb;Persist Security Info=True"
      providerName="System.Data.OleDb"/>
    <add connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\InvData.mdb" providerName="System.Data.SqlClient"/>
  </connectionStrings>
  <!--
    For a description of web.config changes see http://go.microsoft.com/fwlink/?LinkId=235367.

    The following attributes can be set on the <httpRuntime> tag.
      <system.Web>
        <httpRuntime targetFramework="4.7.1" />
      </system.Web>
  -->
  <system.web>
    <sessionState timeout="14400"/>
    <!-- 
            session state timeout = 10 days
            Set compilation debug="true" to insert debugging 
            symbols into the compiled page. Because this 
            affects performance, set this value to true only 
            during development.
        -->
    <identity impersonate="true"/>
    <httpRuntime/>
    <customErrors mode="Off"/>
    <compilation debug="true" targetFramework="4.8">
      <assemblies>
        <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>

        <add assembly="Microsoft.VisualBasic.PowerPacks, Version=9.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
        <add assembly="Microsoft.VisualBasic.Compatibility, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
        <add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        <add assembly="AjaxControlToolkit"/>
        <!--<add assembly="Microsoft.ReportViewer.WebForms, Version=12.0.0.0, Culture=neutral, PublicKeyToken=89845DCD8080CC91"/>
        <add assembly="Microsoft.ReportViewer.Common, Version=12.0.0.0, Culture=neutral, PublicKeyToken=89845DCD8080CC91"/>-->
        <add assembly="Microsoft.Build.Framework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
        <!--<add assembly="dbAutoTrack.DataReports, Version=1.7.0.0, Culture=Neutral, PublicKeyToken=40b2134825d59165"/>-->
        <!--<add assembly="dbAutoTrack.DataReports.Design, Version=1.7.0.0, Culture=Neutral, PublicKeyToken=40b2134825d59165"/>-->
        <add assembly="CrystalDecisions.Web, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
        <add assembly="CrystalDecisions.Shared, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
        <add assembly="log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
        <add assembly="CrystalDecisions.ReportSource, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
        <add assembly="CrystalDecisions.ReportAppServer.Controllers, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
        <add assembly="CrystalDecisions.ReportAppServer.DataDefModel, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
        <add assembly="CrystalDecisions.CrystalReports.Engine, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692FBEA5521E1304"/>
        <add assembly="CrystalDecisions.ReportAppServer.ClientDoc, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/>
        <add assembly="Microsoft.VisualBasic, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
      </assemblies>
      <buildProviders>
        <add extension=".rdlc"
          type="Microsoft.Reporting.RdlBuildProvider, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
        <add extension=".rpt"
          type="CrystalDecisions.Web.Compilation.RptBuildProvider, CrystalDecisions.Web, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/>
      </buildProviders>
    </compilation>
    <!--<authentication mode="Forms">
      <forms name=".ASPXFORMSDEMO" loginUrl="logon.aspx"
      protection="All" path="/" timeout="30" />
    </authentication>-->
    <!--<authorization>
      <deny users ="?" />
      <allow users = "*" />
    </authorization>-->
    <httpModules>
      <add name="UploadModule"
        type="dbAutoTrack.RichTextEditor.UploadModule,dbAutoTrack.RichTextEditor, Version=4.4.0.0, Culture=neutral, PublicKeyToken=40b2134825d59165"/>
    </httpModules>
    <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID"/>
  </system.web>
  <!-- 
        The system.webServer section is required for running ASP.NET AJAX under Internet
        Information Services 7.0.  It is not necessary for previous version of IIS.
    -->
  <system.webServer>
    <modules>
      <add name="UploadModule"
        type="dbAutoTrack.RichTextEditor.UploadModule,dbAutoTrack.RichTextEditor, Version=4.4.0.0, Culture=neutral, PublicKeyToken=40b2134825d59165"/>
    </modules>
    <validation validateIntegratedModeConfiguration="false"/>
    <handlers>
      <add name="ReportViewerWebControlHandler" preCondition="integratedMode" verb="*" path="Reserved.ReportViewerWebControl.axd"
        type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=12.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91"/>
    </handlers>
  </system.webServer>
  <businessObjects>
    <crystalReports>
      <rptBuildProvider>
        <add embedRptInResource="true"/>
      </rptBuildProvider>
    </crystalReports>
  </businessObjects>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35"/>
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35"/>
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
  <system.codedom>
    <compilers>
      <compiler language="c#;cs;csharp" extension=".cs"
        type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
        warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701"/>
      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb"
        type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
        warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+"/>
    </compilers>
  </system.codedom>
</configuration>