The configuration section 'webFarms' cannot be read because it is missing a section declaration

i issued new SSL certificate and install it on the server but when i assign it to the default (localhost) for testing i get the below errors

Detailed Error Information:
Module     ApplicationRequestRouting
Notification       MapRequestHandler
Handler    ExtensionlessUrlHandler-Integrated-4.0
Error Code     0x80070490
Config Error       The configuration section 'webFarms' cannot be read because it is missing a section declaration
Config File    \\?\C:\inetpub\temp\apppools\DefaultAppPool\DefaultAppPool.config

anybody can give me solution ??

According to the error message, please try to create a ‘webFarms’ section declaration inside of configSections, or delete and recreate it again.
https://forums.iis.net/t/1191686.aspx?WFF+2+2+Missing+Section+Error
Besides, incorrect application pool settings can also cause this problem, please just change the .NET Framework version of pool to V4.0 in IIS.

When you encounter this issue, please just change the .NET Framework Version of pool to V4.0 in IIS.

See these links for more details.
The configuration section 'uri' cannot be read because it is missing a section declaration
https://forums.asp.net/t/1839088.aspx