[Jprogramming] Fractals, Visualization and J

[Charles Pechacek]

On page 7, in section 1.5 in "Fractals,Visualization and J", when I attempt to load the script "view_m.ijs", I get the error message "|file name error: script: |0!:0 y[4!:55<'y'". According to "J for C Programmers", a file name error means that "You specified a file name that is invalid, or attempted to read a nonexistent file". I know that the file exists, but don't really know whether or not it is valid. Being a newbie at J, I don't understand the coding included in the message. 
Can someone please explain what's going on here, and let me know where I'm going wrong? Any help will be most appreciated. Thank you.
Charles