after installing DNN and try to open the APPPool in browser it gave me this error

Access to the path 'C:\inetpub\wwwroot\DNN\DotNetNuke.log4net.config' is denied.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.UnauthorizedAccessException: Access to the path 'C:\inetpub\wwwroot\DNN\DotNetNuke.log4net.config' is denied.

farm Details : windows server 2012 R2
SQL 2012