LUA failure.

user1@talk-three-me ~ $ cd Desktop/SLLUA
user1@talk-three-me ~/Desktop/SLLUA $ chmod +x simpleprint.lua
user1@talk-three-me ~/Desktop/SLLUA $ ./simpleprint.lua
./simpleprint.lua: line 1: syntax error near unexpected token `"Hello world!"'
./simpleprint.lua: line 1: `print("Hello world!")'
user1@talk-three-me ~/Desktop/SLLUA $ ./simpleprint.lua
./simpleprint.lua: line 1: syntax error near unexpected token `"hello world"'
./simpleprint.lua: line 1: `print("hello world")'
user1@talk-three-me ~/Desktop/SLLUA $ ./simpleprint.lua
./simpleprint.lua: line 1: syntax error near unexpected token `('
./simpleprint.lua: line 1: `> print("hello world")'
user1@talk-three-me ~/Desktop/SLLUA $ ./simpleprint.lua
./simpleprint.lua: line 1: syntax error near unexpected token `('
./simpleprint.lua: line 1: `> print(11)'
user1@talk-three-me ~/Desktop/SLLUA $ ./simpleprint.lua
./simpleprint.lua: line 1: syntax error near unexpected token `11'
./simpleprint.lua: line 1: `print(11)'
user1@talk-three-me ~/Desktop/SLLUA $

Current file [simpleprint.lua]
print(11)