The mayor declared the meeting opening.这句话有错误吗？

Question

如题所述

Answer 1

The mayor declared the meeting opening.
改为
The mayor declared the meeting open.
declare a meeting open 宣布会议开始
declare the meeting open 宣布开会宣布会议开始

I declare the meeting open. 
我宣布本次会议开始。
​I declare this exhibition open. 

我宣布展览会开幕。