problems specifying font size programmatically from a table

I want to make some items of an RSVP stream more salient by increasing the font size for specific items. Somehow that doesn't work as intended, rather I get a compilation error "Compilation failed.
Sometimes the compiler cannot tell you exactly why, but it is ususally because you made a typo or because you forgot part of the instructions. Check each line of your code, and try to find your mistake.". I can't seem to find my error, though I'm sure it is easy to catch. Help very much appreciated. Below is a stripped-down version of the code.

Best, Jochen



# enter code
options
background color 100 100 100

table myconds
0 "Hello"
1 "World"

fonts
largeFont courier 100
superLargeFont courier 120

task showText
table myconds
set $fontSize @1
if $fontSize == 0
  font largeFont
fi
if $fontSize == 1
  font superLargeFont
fi
#if 0 == 0
#  font largeFont
#fi
show text @2 0 0
delay 500
clear -1

block testBlock
tasklist
showText 2
end