Fix error on line 2 at column 6: XML declaration allowed only at the start of the document

[Solved]

This page contains the following errors:

error on line 2 at column 6: XML declaration allowed only at the start of the document

Below is a rendering of the page up to the first error.

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Check functions.php file to see if there is blank line before the start <?php or not, then check if there is any require code.

ex. require get_parent_theme_file_path('/inc/get_init.php');

check this file '/inc/get_init.php' or delete it. This works for me.

Other Solutions from Internet:

Check your wp-config.php file for blank lines outside of bracketed sections.

Check your theme’s functions.php file for blank lines outside of bracketed sections.

One by one, disable plugins and revalidate until you isolate the one causing the problem ( How To Check For Plugin Conflicts )