During a major version upgrade it is advisable to recompile the classes and routines of all your namespaces (see Major Version Post-Installation Tasks).
do $system.OBJ.CompileAllNamespaces("u")do ##Class(%Routine).CompileAllNamespaces()
To automate this administration task and keep a log of any errors, below is an example of a class to import and compile into the USER namespace that you can use after each upgrade : admin.utils.cls
Class admin.utils.cls

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