Hugo Santos - Head of Search Practice
23 Mar 2023
When migrating an old instance of Sitecore to the latest version of the platform, is not uncommon to find a similar bug to the described one here. Messing with the DLLs version is not that hard, after all.
In this blog, I want to show you an easy step-by-step on how to troubleshoot this kind of issue and not waste hours trying to figure out what is wrong here.
In this case, I was getting this exception in a fully functional new Sitecore 10.2 XM instance when trying to open the License Details in the Control Panel, after migrating an old Sitecore 8.2 website to this new one:
This error message indicates that there is a missing or corrupted assembly file required by the Sitecore application. Here are some steps you can take to try and fix the issue:
It's also worth noting that if you're using Sitecore in a development environment, you may be able to fix the issue by simply restoring the NuGet packages for the project in Visual Studio. This will download and install any missing or corrupted DLL files that may be causing the issue.
In my specific case, the issue was a third-party library. As suggested, I’ve used fuslogvw to identify which NuGet reference was the guilty one. Since we are talking about a Sitecore Upgrade project, many NuGet references had to be upgraded too, and one of them was actually upgraded to the wrong version, no longer matching the current Sitecore .Net version.
After it, it was an easy fix: change its version so that it matches our Sitecore .Net version library, and call it a day:
Hugo specializes in search and automation, including testing automation. He is bright, amiable, and energetic. As a Sitecore Architect, he is passionate about creating great solutions that don't just follow best practices but further them. His passion for doing great work is equaled only by his willingness to share his expertise with the Sitecore community by blogging and advocacy, like helping to organize the Quebec Sitecore User Group while in Canada. Hugo is a four-time Sitecore Technology MVP, in recognition for all that he does for the Sitecore Community.