[Avodah] dikduk error

[Saul.Z.Newman at kp.org]

from rHM's blog

Rav Yaakov Kaminetsky zt?l, in a not terribly successful attempt to get us 
to be serious about our Hebrew language classes in Mesifta Torah Vodaath, 
told us that he once discovered a major halachic error in a well known 
acharon that was based on a simple dikduk mistake. Regrettably, we were 
not suitably impressed. 


---  does anyone know what  this refers to?

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