3.5.1 to 3.5.2 Upgrade causes "Server Error in '/' Application."

[ISD1]

I just tried upgrading my 3.5.1 installation to 3.5.2. I followed the instructions of "To upgrade to 3.5.2 just replace the original files with the ones in the zip file.", and after rebooting the server, and navigating a web browser to lansweeper's Interface, I now get:

Server Error in '/' Application.
Runtime Error
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.

Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".

<!-- Web.Config Configuration File -->

<configuration>
<system.web>
<customErrors mode="Off"/>
</system.web>
</configuration>


Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL.

<!-- Web.Config Configuration File -->

<configuration>
<system.web>
<customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
</system.web>
</configuration>

Any help here?

[ISD1]

Resetting Permissions on the changed files solved it. Thanks.

[Hemoco]

Most common mistake: make sure all files in the website have "everyone full control"