'Step over , step into and step buttons are disabled in chrome browser (debugging mode)

I am trying to debug java script in chrome. But i see that step over , step into and step buttons are disabled hence i am unable to continue with debugging.

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Solution 1:[1]

Have you set breakpoints in your code already? If yes, then your program is not stepping into that code.

Solution 2:[2]

Go to source in developer tools at the top right corner you will find setting button, click on it and you will see source related category all check boxes, you have to enable the tab moves focus boom thats it.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 lucaswerner
Solution 2 Tyler2P