compilation failed

[AMIRKHANEF]

Hello,
I read your article and became very interested, I found your gateway with a lot of searching, but I had a problem running your program.
I got this error:

cmd: 'zokrates compile -i ./build/modified.zok -o ./build/compiled;'
  },
  stdout: 'Compiling ./build/modified.zok\n' +
    '\n' +
    'Compilation failed:\n' +
    '\n' +
    'build/modified.zok:\n' +
    '\t  --> 41:18\n' +
    '   |\n' +
    '41 |     isCommitted == 1␊\n' +
    '   |                  ^---\n' +
    '   |\n' +
    '   = expected unaried_term\n',
  stderr: ''
}
bye!

cheers