If your header is stuck and you’re unable to modify it, your problem is likely a mis-configuration in a file entitled “wp-config.php” or one of its brothers. How to fix this bug or what one should do to make header information modifiable?
Here is the solution for it. To address this issue, you should simply download the file in question, open it and take a look for any possible mistaken spaces or line breaks that may be obliterating its ability to function properly. Upload the updated file again and your issue should be taken care of.
When you will turn on the debugger from the wp-config.php you can find the file in which spaces areexists on the top or bottom of the files that’s why header issue you are facing. Most probably check your functions.php file and remove the spaces form it.
