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The issue was reported to LV R&D as Bug 2317159. It was introduced in LabVIEW 2022 Q3 and fixed in LabVIEW 2023 Q3. The Error 13 occurs when the LabVIEW Class private data includes certain types of .NET references, or a reference to a .chm help file. More details: LabVIEW 2022 Q3 included a "fix" to how linkages to .NET assemblies are adjusted in a build output. Unfortunately this "fix" caused the issue you're seeing. LabVIEW 2023 Q3 uses a new mechanism for app builder caching under the hood, which removed the codepath that was causing the Error 13 altogether.