add: try 
context: exists : function (path) {    if(!path){        dump("Missing path argument . . . \n\n");        return;    }    //dump("\n\n**** Checking to see if the file exists ****\n\n");    try{         var file                = new FilePath(path);        var fileExists          = file.exists();    }    catch(error) { dump("**** ERROR:"+error+"\n\n"); }    return fileExists;},
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/46e7c638c4651d5af5b1ea9556848414e43314af/io.js/buggy/xpcom/tests/utils/io.js