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I think it is because you are trying to edit functions.php in your active theme through theme editor from wp-admin. You can edit the file by downloading in your local pc then upload through cpanel/ftp.
- If there’s any “security” plugin, disable it.
- Change the memory limit
- Delete the object-cache.php file
- Disable cache plugin.
If it still doesn’t work, use FTP as @mgscoder suggested.
Thanks, I tried from editing from Hpanel. now it is working.