Troubleshoot all directories in a simple csh program

I know csh is bad, but required for this job. Anyway, I'm trying to write a program to evaluate a set of student sets in a directory called dropbox:

#!/bin/csh
#
foreach directory (`ls dropbox`)
  if( ! -e dropbox/$directory/calculator ) then
   mkdir dropbox/$directory/calculator
   touch dropbox/$directory/calculator/comments
   echo "Directory did not exist and was created automatically" > dropbox/$directory/calculator/comments
  else
   touch dropbox/$directory/calculator/comments
   if( ! -e dropbox/$directory/calculator/calc.csh ) then
    echo "No submission from $directory at `date`" > dropbox/$directory/calculator/comments
   else if( ! -x dropbox/$directory/calculator/calc.csh ) then
    echo "Script not executable: -5 points" > dropbox/$directory/calculator/comments
   else
    touch dropbox/$directory/calculator/results
    echo "Results for $directory calculator script:" > 
    dropbox/$directory/calculator/calc.csh /afs/nd.edu/coursesp.14/cse/cse20189.01/files/hw5/calc > dropbox/$directory/calculator/results
    echo "Testing complete for $directory" > dropbox/$directory/calculator/results
   endif
  endif
end

Results for ls dropbox(All directories):

betty  charles  frank   izzy    lisa   ophelia  rosie  uhura   xena
bill   don      george  jackie  mark   paul     sandy  victor  yarek
bob    erin     hiram   kathy   nancy  quentin  tom    wally   zela

When I run the script, it returns a message stating that the directory is not declared. Any tips?