HTTP 502.5 Error while running Sitecore Horizon

Error Description

I faced a strange issue after successfully installing Sitecore Horizon on my local machine.

The error was a HTTP 502.5 - Process Failure error, when I opened Sitecore Horizon on the browser.

I tried restarting the site a few times. But, that did not resolve the error.

I took up a look on the Event Viewer. The error logged was as shown below.

Application 'MACHINE/WEBROOT/APPHOST/SC93SC.DEV.LOCALAUTHORINGHOSTCLIENT' with physical root 'C:\inetpub\wwwroot\sc93sc.dev.localauthoringhostclient' failed to start process with commandline 'dotnet .\Authoring.Host.dll', ErrorCode = '0x80004005 : e0434352.

Screenshot of the error for reference:

I started my Command Prompt in the site path and executed 'dotnet .\Authoring.Host.dll'.

The command gave the below error message:

The error mentioned that the license file was missing. I looked up the DLL Sitecore.Framework.Runtime.dll and searched for the path where Horizon was searching for the license file.

The path was horizon-authoring-site-root\sitecoreruntime\license.xml.

In my case, it was C:\inetpub\wwwroot\sc93sc.dev.localauthoringhostclient\sitecoreruntime\license.xml.

I copied my license file to this root, and restarted my horizon site instance.

After this, Horizon started to work fine without any error.

Solution for the error

1. Copy the license.xml file to the folder in the path: horizon-authoring-site-root\sitecoreruntime.

2. Restart the site.

Please drop a comment below if you have any queries.

Happy Sitecoring!!