Each Key Must Be A Number Of String; Got Function

I have this scenario in Cucumber: Scenario Outline: Protractor and Cucumber Test InValid Given I have already...... When I fill the .... Examples:

Solution 1:

You have your arguments in the wrong order. callback is always the last element in the arguments list.

fix:

When('I fill the {int}',{timeout: 90 * 1000},  function(number, callback) {

        element(by.css("*[id='field_identificador']")).click();
        element(by.css("*[id='field_identificador']")).sendKeys(number).then(callback);

    });