Conflict between section 179(3) and section 186 of companies act 2013

There seems to be a conflict between Section 179(3) and Section 186 of Companies Act 2013.Section 179(3) authorizes the Board to delegate its powers to enter into specified transactions to any committee of directors, the managing director, the manager or any other principal officer of the company or in the case of a branch office of the company, the principal officer of the branch office. However, Section 186 requires consent of all directors present in the meeting for approving such transactions. Will section 186 prevail over section 179(3) ? OR Is harmonious interpretation required?