This is what happens when you (or an extension) have defined some so-called ‘verbless grammar’, i.e. when you have an ‘Understand “[token] …” as blah-ing’ line somewhere in your code- in other words the first word of the ‘Understand…’ text is a grammar token and not a verb word. It’s a bug with Inform’s implementation of this situation- see discussion (and a fix- for 9.3/6M62) here.
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