Issue with setting the week

[rajeshwar-fissionlabs]

When i am setting the week of the day using

cronExp.addValue('dayOfTheWeek', week);
cronExp.addValue('dayOfTheMonth', day);
cronExp.addValue('monthOfTheYear', month);

i am getting the following error.

Uncaught TypeError: value.indexOf is not a function

This is the screenshot of the issue

I hope the issue is in the below function