The word(s) "err" appears 106 time(s) in 99 verse(s) in Quran in Muhammad Pickthal translation.

(61) And We verily gave knowledge unto David and Solomon, and they said: Praise be to Allah, Who hath preferred us above many of His believing slaves!

(62) Nor canst thou lead the blind out of their error. Thou canst make none to hear, save those who believe Our revelations and who have surrendered.

(63) Lo! He Who hath given thee the Qur'an for a law will surely bring thee home again. Say: My Lord is Best Aware of him who bringeth guidance and him who is in error manifest.

(64) Nor canst thou guide the blind out of their error. Thou canst make none to hear save those who believe in Our revelations so that they surrender (unto Him).

(65) This is the Creation of Allah. Now show me that which those (ye worship) beside Him have created. Nay, but the wrong-doers are in error manifest!

(66) And it becometh not a believing man or a believing woman, when Allah and His messenger have decided an affair (for them), that they should (after that) claim any say in their affair; and whoso is rebellious to Allah and His messenger, he verily goeth astray in error manifest.

(67) And when thou saidst unto him on whom Allah hath conferred favour and thou hast conferred favour: Keep thy wife to thyself, and fear Allah. And thou didst hide in thy mind that which Allah was to bring to light, and thou didst fear mankind whereas Allah hath a better right that thou shouldst fear Him. So when Zeyd had performed that necessary formality (of divorce) from her, We gave her unto thee in marriage, so that (henceforth) there may be no sin for believers in respect of wives of their adopted sons, when the latter have performed the necessary formality (of release) from them. The commandment of Allah must be fulfilled.

(68) Hath he invented a lie concerning Allah, or is there in him a madness? Nay, but those who disbelieve in the Hereafter are in torment and far error.

(69) Say: Who giveth you provision from the sky and the earth? Say: Allah, Lo! we or you assuredly are rightly guided or in error manifest.

(70) Say (unto them, O Muhammad): I exhort you unto one thing only: that ye awake, for Allah's sake, by twos and singly, and then reflect: There is no madness in your comrade. He is naught else than a warner unto you in face of a terrific doom.