I just updated the meta_tags.php file and all of a sudden I was getting this error. I looked into the files that the error message were showing up on and I realized two things.

1.) There were some extra spaces so I removed the blank lines mentioned in the error core.

2.) I looked at the rites of the file when I placed it onto the server and It stripped all the read write settings. All the other files in the folder were 777 so I set the files that were getting errors to 777 and that stopped the updating header issue.