This mod is outdated and does indeed cause some problems if you use it as is. A less obvious bug, for example, is having the chest in the throne room of your towns/castles show the goods' merchant inventory. Here's what you need to change to be able to use the mod on 1.174:
Open the scenes.txt file that comes with the mod in WinMerge (a utility that compares two files or folders and highlights any differences) side by side with the modern, Native scenes.txt, and change the dozens of three-digit numbers scattered across the file to what they are in vanilla. Plus vanilla has gained one extra multiplayer scene since the mod was last updated in 2013, so you'll also have to copy and paste its entry into the mod's scenes.txt and add 1 to the number in the beginning of the file (that number is for how many scenes there are in total).
Open the scenes.txt file that comes with the mod in WinMerge (a utility that compares two files or folders and highlights any differences) side by side with the modern, Native scenes.txt, and change the dozens of three-digit numbers scattered across the file to what they are in vanilla. Plus vanilla has gained one extra multiplayer scene since the mod was last updated in 2013, so you'll also have to copy and paste its entry into the mod's scenes.txt and add 1 to the number in the beginning of the file (that number is for how many scenes there are in total).