tmx upgrade to sdltm

I have a tmx file fronm a client that I need to upgrade to sdltm format, but when I use the Upgrade Translation Memories function I get this message. Clicking the Knowledge Base and Community links in the dialogue is not very helpful, I'm afraid. I temporarily solved the problem by creating a new tm and importing the tmx into that tm, but I still need to try to find why the Upgrade Translation Memories function does not work. I'm on the latest version of 2021.

"Attempt by method 'Sdl.TranslationStudio.TranslationMemoryMigration.UI.TranslationMemoryMigrationWizardFactory.CreateWizard(Sdl.LanguagePlatform.TranslationMemoryMigrationApi.ITranslationMemoryMigrationWizardData)' to access method 'Sdl.Desktop.Platform.WPF.ViewModel.WPFWizardFormViewModel`1..ctor(Sdl.Desktop.Platform.WPF.Wizard.WPFWizardWindow, Sdl.Desktop.Platform.Wizard.IProgressHeader)' failed."

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