Minecraft multiplayer /execute command bug.

So I was trying to copy and paste one of my game mechanics to a multiplayer world to demonstrate it to my friend. One thing that I noticed is that when I pasted the exact same command and putting the layout exactly the same as I did in my singleplayer world it said "Unknown Command" and the command didn't operate well. When I tried to paste it into a separate command block and activate it manually with a button... It worked...

What I expected to happen was...:
The command that worked pefectly in singleplayer to work in multiplayer

What actually happened was...:
The command was not perfoming at all.