There are two possible causes for this message:
1. You gave too many inputs to a command. MicroWorlds EX doesn't know what to do with this extra input.
Here are some examples:
print 3 4
Print will take the 3 as input but MicroWorlds EX doesn't know what to do with the 4.
fd 50 10
Fd will take the 50 as input but MicroWorlds EX doesn't know what to do with the 10.
2. An instruction began with something that reports a value. Every instruction must begin with a command. Here is an example:
5 + 16
I don't know what to do with 21
5 + 16 reports 21. You have to tell MicroWorlds EX what to do with this number.
Do you want to show it in the Command Center?
show 5 + 16
21
Do you want to print it in a text box?
pr 5 + 16
Do you want to use it as input for another command?
setsh 5 + 16
fd 5 + 16
The arithmetic signs (+, -, >, <) are reporters, like the primitives color, pos, and shape. They "say" something (the result of the operation, the current position of the turtle).
Show, print, and
forward are commands. They don't report
anything. They just "do" something.