I've just received that message in my game as Saxony. I suppose that "generic treaty" was meant to be "peace treaty". A revolution happened in Saxe-Meiningen sometime in the later 1830s. The new republic allied itself to Switzerland (minor German republics seem to love the Swiss), but was promptly annexed by me. My peace treaty expired in 1845, giving me that strange message. On a side note, Switzerland is being smashed by the French at this point in time.
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