I believe this macro is related to bitvodoo viewtracker plugin here: https://marketplace.atlassian.com/plugins/ch.bitvoodoo.confluence.plugins.viewtracker
I recommend to check if the plugin license is not expired and contact the plugin vendor to check the license as well.
The pugin vendor has replied with the following:
This isn't a error thrown by our plugins. In our code isn't such String and our registration framework doesn't expire any registered free add-on.
So I'm sorry, we aren't responsible for this error message.
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