Contradiction with Psalms 94:19
While Psalms 48:6 speaks of fear taking hold upon people, Psalms 94:19 speaks of consolation bringing joy to the soul amidst multitude of thoughts.
Psalms 94:19: In the multitude of my thoughts within me thy comforts delight my soul.
Contradiction with John 14:27
Psalms 48:6 mentions trembling and fear, whereas John 14:27 mentions peace and not being troubled or afraid.
John 14:27: Peace I leave with you, my peace I give unto you: not as the world giveth, give I unto you. Let not your heart be troubled, neither let it be afraid.
Contradiction with Isaiah 41:10
Psalms 48:6 describes fear, while Isaiah 41:10 encourages not being afraid due to God's presence and strength.
Isaiah 41:10: Fear thou not; for I [am] with thee: be not dismayed; for I [am] thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness.