https://community.fabric.microsoft.com/t5/Report-Server/An-error-occurred-creating-the-configuration-section-handler-for/m-p/4153753#M36761 <H1>An error occurred creating the configuration section handler for system.data: Column 'InvariantName' is constrained to be unique. Value 'MySql.Data.MySqlClient' is already present. (C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config line<BR /><BR /></H1><P><img /></P><P>&nbsp;</P><H1><BR /><BR /><BR /><BR /></H1> Tue, 17 Sep 2024 05:29:58 GMT insandur 2024-09-17T05:29:58Z https://community.fabric.microsoft.com/t5/Report-Server/An-error-occurred-creating-the-configuration-section-handler-for/m-p/4153753#M36761 <H1>An error occurred creating the configuration section handler for system.data: Column 'InvariantName' is constrained to be unique. Value 'MySql.Data.MySqlClient' is already present. (C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config line<BR /><BR /></H1><P><img /></P><P>&nbsp;</P><H1><BR /><BR /><BR /><BR /></H1> Tue, 17 Sep 2024 05:29:58 GMT https://community.fabric.microsoft.com/t5/Report-Server/An-error-occurred-creating-the-configuration-section-handler-for/m-p/4153753#M36761 insandur 2024-09-17T05:29:58Z https://community.fabric.microsoft.com/t5/Report-Server/An-error-occurred-creating-the-configuration-section-handler-for/m-p/4153758#M36966 <H1>An error occurred creating the configuration section handler for system.data: Column 'InvariantName' is constrained to be unique. Value 'MySql.Data.MySqlClient' is already present. (C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config line<BR /><BR /></H1><P><img /></P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P> Tue, 17 Sep 2024 05:33:54 GMT https://community.fabric.microsoft.com/t5/Report-Server/An-error-occurred-creating-the-configuration-section-handler-for/m-p/4153758#M36966 insandur 2024-09-17T05:33:54Z https://community.fabric.microsoft.com/t5/Report-Server/An-error-occurred-creating-the-configuration-section-handler-for/m-p/4155565#M36772 <P><FONT>Hi,&nbsp;<a href="javascript:void(0)" data-lia-user-mentions="" data-lia-user-uid="392174" data-lia-user-login="insandur" class="lia-mention lia-mention-user">insandur</a></FONT>&nbsp;</P> <P>You can locate the machine.config file:<BR />For 32-bit systems: C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config<BR />For 64-bit systems: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config<BR />Then open the machine.config file in a text editor with administrative privileges. Search for the MySql.Data.MySqlClient entry under the &lt;DbProviderFactories&gt; section. Try to Remove or comment out the duplicate entry. Ensure that only one entry for MySql.Data.MySqlClient exists. Save the file and restart your application or service.</P> <P>&nbsp;</P> <P><SPAN><A title="https://community.powerbi.com/t5/community-blog/how-to-get-your-question-answered-quickly/ba-p/38490" href="https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcommunity.powerbi.com%2Ft5%2FCommunity-Blog%2FHow-to-Get-Your-Question-Answered-Quickly%2Fba-p%2F38490&amp;data=05%7C02%7Cv-yohua%40microsoft.com%7Ce1106bfabecb4734a5cc08dc2305bc51%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638423754744679080%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&amp;sdata=24%2BceC5sFd3n3%2FhFDYILWFcNjCwVClBD%2BPBsSLVfJGk%3D&amp;reserved=0" target="_blank" rel="noopener nofollow noreferrer">How to Get Your Question Answered Quickly</A></SPAN></P> <P><SPAN>Best Regards</SPAN></P> <P><SPAN>Yongkang Hua</SPAN></P> <P><SPAN>If this post&nbsp;<STRONG>helps</STRONG>, then please consider&nbsp;<STRONG>Accept it as the solution</STRONG>&nbsp;to help the other members find it more quickly.</SPAN></P> Wed, 18 Sep 2024 02:47:25 GMT https://community.fabric.microsoft.com/t5/Report-Server/An-error-occurred-creating-the-configuration-section-handler-for/m-p/4155565#M36772 Anonymous 2024-09-18T02:47:25Z https://community.fabric.microsoft.com/t5/Report-Server/An-error-occurred-creating-the-configuration-section-handler-for/m-p/4331412#M38946 <P>In my case I upgraded v8.0.30 to v9.0.0 and found a duplicate entry in the machine.config file.&nbsp;<BR />Deleted the line that was related to old version.<BR />Restarted machine.<BR /><BR />Everything is working ok now.<BR />Thanks.</P> Mon, 16 Dec 2024 18:43:32 GMT https://community.fabric.microsoft.com/t5/Report-Server/An-error-occurred-creating-the-configuration-section-handler-for/m-p/4331412#M38946 EZReinert 2024-12-16T18:43:32Z