Cannot read property 'length' of undefined at type in javascript -

i have 2 errors: cannot read property 'length' of undefined @ type , typing. wrong?

settimeout(function typing() {  var fields = document.queryselectorall('input'); var text = ["text", "text", "text", "text"];  function print (input, num, timeout) {     settimeout(function(){         var = 0;         function type(){             if (i <= text[num].length) {         input.value = text[num].substr(0, i);         settimeout(type, 100);             }             console.log(text[num].length);             i++;         }         type();         console.log(type());         if (num == 3) {         settimeout(             function() {             document.getelementbyid('postlogo_animation').classname +=" postlogo-img"             },text[num].length * 120);         }     }, timeout); }  (var b = 0; b < fields.length; b++) {     var timeout = 0;     var input = fields[b];     if (b > 0) {         (var c = 0; c < b; c++) {             timeout += text[c].length * 140         }     }     print(input, b, timeout) }}, 1000); 

cannot read property 'length' of undefined @ type , typing. wrong? here console