The request filtering module is configured to deny a request that contains a double escape sequence. PHP error

The error is referred to below.

HTTP Error 404.11 - Not Found

The request filtering module is configured to deny a request that contains a double escape sequence.
In order to fix this issue, you have to add the code mentioned below in the web.config file, if web.config file is not present then you have to make it one.
<configuration>

<system.webServer>

<security>

<requestFiltering allowDoubleEscaping="true">

</requestFiltering>

</security>

</system.webServer>

</configuration>

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