Override uploadReadAheadSize parameter in web.config

I need to overwrite the parameter uploadReadAheadSize but when I add this line to the web.config:

<location path="es/testssl.aspx">
      <serverRuntime uploadReadAheadSize="99000"/>

I get an error:

HTTP Error 500.19 - Internal Server Error
The requested page cannot be accessed because the related configuration data for the page is invalid.

My ISP has told me that the allowOverride param is enabled in the ApplicationHost.config, so, I don't undertand why I am getting this error.

I had IIS7.0 in my ISP and I am working with  c# framework3.5

thanks in advance
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