This error is generated in wp-login.php , it happens if server is unable to set cookies, this can happen due to several reasons, one of the common issue is: output being sent before setting up of cookies.
Try out following options:
- Update WordPress core, if it is not up to date
- change theme, if you are using custom theme
- If issue still persists, rename plugin folder
- Also check error log, errors may not be printed to screen.
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