Contradiction with Proverbs 16:18
This verse suggests that pride leads to destruction, while 1 Chronicles 15:8 involves the context of a collective task for God's glory, not personal pride.
Proverbs 16:18: Pride [goeth] before destruction, and an haughty spirit before a fall.
Contradiction with Matthew 6:2
This verse warns against seeking attention for righteous acts, while 1 Chronicles 15:8 involves organizing a large public event.
Matthew 6:2: Therefore when thou doest [thine] alms, do not sound a trumpet before thee, as the hypocrites do in the synagogues and in the streets, that they may have glory of men. Verily I say unto you, They have their reward. [do not...: or, cause not a trumpet to be sounded]