Contradiction with Proverbs 21:13
While Psalms 119:149 emphasizes being heard by God, Proverbs 21:13 suggests that those who ignore the cries of the poor will themselves not be heard.
Proverbs 21:13: Whoso stoppeth his ears at the cry of the poor, he also shall cry himself, but shall not be heard.
Contradiction with John 9:31
Psalms 119:149 implies that God hears prayers, whereas John 9:31 states that God does not listen to sinners.
John 9:31: Now we know that God heareth not sinners: but if any man be a worshipper of God, and doeth his will, him he heareth.
Contradiction with Isaiah 59:2
Psalms 119:149 assumes God's attentiveness, but Isaiah 59:2 explains that sin can create a separation that prevents God from hearing.
Isaiah 59:2: But your iniquities have separated between you and your God, and your sins have hid [his] face from you, that he will not hear. [have hid: or, have made him hide]
Contradiction with James 4:3
Psalms 119:149 mentions God hearing pleas, while James 4:3 notes that prayers can go unheard if asked with wrong motives.
James 4:3: Ye ask, and receive not, because ye ask amiss, that ye may consume [it] upon your lusts. [lusts: or, pleasures]
Contradiction with Ezekiel 8:18
Psalms 119:149 suggests a responsive God, yet Ezekiel 8:18 warns that God will not listen in the face of great iniquity.
Ezekiel 8:18: Therefore will I also deal in fury: mine eye shall not spare, neither will I have pity: and though they cry in mine ears with a loud voice, [yet] will I not hear them.