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Error Code: N.A. Error Message: Could not load file or assembly 'XXXXXXXXXXXX, Version=9999999999, Culture=XXXX, PublicKeyToken=XXXXXXXXX' or one of its dependencies. The system cannot find the file specified. Cause(s): Required assembly (e.g. dll) has not been installed or a different version has been installed. Solution(s): Install or reinstalled the required assembly. If the exact version of the assembly is no longer available, you can locate the information of the version installed via power shell. Locate the full path of the assembly (search C:\Windows\assembly if you are not sure) Open windows power shell Enter ([system.reflection.assembly]::loadfile("< ASSEMBLY FULL PATH >")).FullName Update your web.config with the version information.

Error Code: 0x80070021 Error Message: This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false". Cause(s): Application development features have not been turned on in Windows Solution: Go to "Turn Windows features on or off" in Windows control panel Go to Internet Information Services > World Wide Web Services > Application Development Services Turn on all features except CGI Click on, then Download files from Windows Update Allow installation to complete and refresh your page.