There are three points that are currently encountered for the time being (I will add more in the future to find more)

Obviously, the official downloaded MOD was downloaded as an unofficial channel.Note 1: The mod will only pop up a window when the MOD is open normally

Version 1.5 and above games will collapse (no solution is found for the time being) here can only be used with 1.12.2.Maybe some versions will collapse

Click Place to pop up the warning window (population name Notification)

The current known solution:

I have also appeared at the beginning of this problem, and this problem not only has this problem.

Feasible solution: Close the game, enter the MOD folder, drag out the MOD and open the game. After the game starts normally, turn off the game. The MOD will be added again and then open the game.

3. Reason: No click to download the building & not use Place items in the game

Feasible solution: First download (ADD) you like (ADD) in the search, and then right -click on the map in the map and then place the building.

Note 2: After clicking ADD, the lower left corner will appear