Production env modifier error

We haven't seen a visible fault within our production environment but within the Statamic log it is full of these errors:

production.NOTICE: Error in [to] modifier: Could not find files to load the `to` modifier.

I don't think it's closely related but the author of this post mentioned a similarly strange modifier error but there was no mention about the actual fix for it

Whereas on our development environment we do not see these errors. What could be some possible causes for this "error"?

>>>>>>> Unanswered <<<<<<<
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