I think you've created a variable with the name area somewhere in your code.
Can you add this code, immediate above the line of code that is calling the area command?
which -all area
whos area
- The which command will tell you if there is another file called area shadowing the built-in copy of area, or if area is the name of a variable in your workspace. Look at the first line of output to see if it says "area is a variable."
- The whos command will tell you about the variable area if it exists in your workspace.
