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# citrix-app-layering
s
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b
We updated the OS layer with .NET 4.8 in preparation to upgrade the VDA from 1912 to 2203. Now quite a few applications are failing to launch with the following error in the Application evet log [redacted]: Log Name: Application Source: .NET Runtime Date: 6/13/2023 25857 PM Event ID: 1026 Task Category: None Level: Error Keywords: Classic User: N/A Computer: ###### Description: Application: [multiple apps] Framework Version: v4.0.30319 Description: The process was terminated due to an unhandled exception. Exception Info: System.IO.FileLoadException
r
try recreating one of the layers see if it gets fixed.
b
No luck. Recreated an elastic layer and got the same error. Interesting to note that burning that same layer into the VHD works fine. Its something with elastic.
r
did you test without all the other elastic layers? That might be necessary.
b
Yeah, no dice.
Updated the ELM in anticipation of summitting a support ticket and it broke the ability to make layer versions. Spent the entire day fixing THAT problem yesterday. That's fixed now, but it did not help our original .NET issue.