This may be in your code, php. If you are working in the editor's backend, sometimes leaving out a simple symbol "(" could do it. Or you could load an image, as I did, then there is no way to find out "why." The easiest solution, other than going through your code is to put your site on a different theme. Go in and delete the existing theme with the parse error, and re-install it as a new theme. Then you can move the new version of the theme to your original site once again. This is what worked for me. But, always backup your files before doing anything. And always be cautious of taking information from the internet without a second opinion. There are 'true' WPress experts on this forum who know much more than I do. I'm sure some will be chiming in soon. Good luck!

But the thing is that when I paste original HTML file in the document, it still shows the same thing. I don't get it...

Paste the code from line 70 - 80