Unable to edit Header

Greetings,

Getting the following message when trying to paste backed up code for Theme Header. I tried to install Google tracking by editing the code and the entire code disappeared. Probably should have left the code alone, but I do have a backup. Just need a way to upload the code but keep getting this error message. Thanks.

“Unable to communicate back with site to check for fatal errors, so the PHP change was reverted. You will need to upload your PHP file change by some other means, such as by using SFTP.”