Check that all square brackets on the Procedures page are in matched pairs, with the same number of opening brackets as closing ones. On the Procedures page, you can format (arrange) procedures the way you like to make them easier to read. Opening and closing brackets don't have to be on the same line, but they have to match inside each procedure:
to spellstar
repeat 5 [turtletype "star
repeat 4 [fd 30]
rt 144]
end
Also, make sure you don't have a semicolon between brackets. MicroWorlds ignores any text between a semicolon and the next carriage return (this text is treated as a comment). A vertical line ( | ) without its matching pair within brackets can also produce this message.
