Add AdWordsApi keys to App.config - vb.net

Question

I an developing a Windows form Application using VB. My software will connect to a SQL Database and to a Google Adwords API. The problem is when I try to Add the keys for the Adwords Api in the App.config file I get the following error: "Configuration system failed to initialize: AdWordsApi configuration section not recognized". I have read some examples about hoy to fill my Appconfig file but nothing seems to work. Could you help me know the proper way to do it? I leave here my App.config file
<?xml version="1.0"?>
<configuration>
<configSections>
<sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=XXXXXXXXXXXXXX">
<section name="ReporteExcel.My.MySettings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=XXXXXXXXXXXXX" requirePermission="false"/>
</sectionGroup>
</configSections>
<AdWordsApi>
<add key="MaskCredentials" value="true"/>
<add key="EnableSoapExtension" value="true"/>
<add key="EnableGzipCompression" value="true"/>
<add key="IncludeUtilitiesInUserAgent" value="true"/>
<add key="ProxyServer" value=""/>
<add key="ProxyUser" value=""/>
<add key="ProxyPassword" value=""/>
<add key="ProxyDomain" value=""/>
<add key="DeveloperToken" value="XXXXXXXXXXXXXXXXX"/>
<add key="GeneralClientCustomerId" value="XXX-XXX-XXXX"/>
<add key="CanalDigitalClientCustomerId" value="XXX-XXX-XXXX"/>
<add key="BanamexClientCustomerId" value="XXX-XXX-XXXX"/>
<add key="AuthorizationMethod" value="OAuth2"/>
<add key="OAuth2ClientId" value="XXXXXXXXXXXXX-XXXXXXXXXXXXXXXXXXXXXXXX.apps.googleusercontent.com"/>
<add key="OAuth2ClientSecret" value="XXXXXXXXXXXXXX-XXXXXXX"/>
<add key="OAuth2RefreshToken" value="1/XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX-XXXXXXXXXXXXXXXXXXXXX-X"/>
<add key="WebClientCustomerId" value="XXX-XXX-XXXX"/>
<add key="SkipReportHeader" value="true"/>
<add key="SkipReportSummary" value="true"/>
<add key="SkipColumnHeader" value="false"/>
</AdWordsApi>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup>
<applicationSettings>
<ReporteExcel.My.MySettings>
<setting name="sqlConnectionStr" serializeAs="String">
<value>Data Source=192.168.2.1;Initial Catalog=CATALOG;User ID=ADMIN;Password=ADMIN;</value>
</setting>
</ReporteExcel.My.MySettings>
</applicationSettings>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="Google.AdWords" publicKeyToken="XXXXXXXXXXX" culture="neutral"/>
<bindingRedirect oldVersion="18.33.0.0" newVersion="18.34.0.0"/>
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Google.Ads.Common" publicKeyToken="XXXXXXXXXXXXXX" culture="neutral"/>
<bindingRedirect oldVersion="3.17.0.0" newVersion="3.18.0.0"/>
</dependentAssembly>
</assemblyBinding>
</runtime>
</configuration>

Answer 1

As it reads the file, the configSections act as a Table of Contents for the file
Try the following change and see if it will recognize it. taken from here
<configSections>
<sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=XXXXXXXXXXXXXX">
<section name="ReporteExcel.My.MySettings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=XXXXXXXXXXXXX" requirePermission="false"/>
</sectionGroup>
<section name="AdWordsApi" type="System.Configuration.DictionarySectionHandler"/>
</configSections>