[Sanjip Shah]

@Petrichor This can be caused due to many possible things. Please go through links in this search and see if any helps you
https://www.google.com.np/search?q=cannot+modify+header+information+on+child+theme&ie=utf-8&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&gws_rd=cr&ei=O_CGUoeiMcqnrgffi4GwAg