Kicked from the server when I trigger command block with "tellraw" command

I was testing a /tellraw command for my welcome message in my 1.11 server and I got kicked once I pressed the button. Attached to this report there is a screenshot with the error message. Here's the command I used: /tellraw @p ["",{"text":"Welcome to ","color":"dark_purple"},{"selector":"@e[tag=!Player]","bold":true,"color":"none"},{"text":" !!","bold":false,"color":"none"}]