Solution:1
The error is trigged in core, but the reason is probably in your theme. I’m guessing one of your php files has a space or linefeed before or after the php tags.
Solution:2
How to Fix Warning: Cannot modify header information in WordPress.
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- Too many spaces before, in between or after the beginning PHP tags
- There are too many unneeded spaces or blank lines in a specific part of a document
- Incorrect PHP Encoding Format.
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1. Open wp-config with editor, and remove all spaces before “<?php” and after “?>“