Meaning of 弘法筆誤 in Japanese

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Definition of 弘法筆誤

あやまる(ayamaru) 【誤る ·謬る】

(v5r, vi) to make a mistake; to err
ウィリーは誤って父親の猟銃を発砲し、壁に穴を開けた。
Willie accidentally let off his father's shotgun and made a hole in the wall.
to mislead; to misguide

ふで(fude) 【筆】

ぐほう(guhou) 【弘法】

(n, vs) spreading Buddhist teachings
弘法筆を選ばず。
A bad carpenter quarrels with his tools.