Fatal Error

Hi, error when trying to activate the plugin. I have set the .htaccess permissions to 777 and add the provided codes to .htaccess but still not working

Error message below:

Warning: copy(.htaccess_lscachebak_orig): failed to open stream: Permission denied in ../wp-content/plugins/litespeed-cache/admin/litespeed-cache-admin-rules.class.php on line 348 ERROR 9042: .htaccess file not writable.

Please add/replace the following codes into the beginning of .htaccess:
# BEGIN LSCACHE
## LITESPEED WP CACHE PLUGIN – Do not edit the contents of this block! ##
<IfModule LiteSpeed>
RewriteEngine on
CacheLookup on
RewriteRule .* – [E=Cache-Control:no-autoflush]
RewriteRule ^min/\w+\.(css|js) – [E=cache-control:no-vary]

### marker CACHE RESOURCE start ###
RewriteRule wp-content/.*/[^/]*(responsive|css|js|dynamic|loader|fonts)\.php – [E=cache-control:max-age=3600]
### marker CACHE RESOURCE end ###

### marker FAVICON start ###
RewriteRule favicon\.ico$ – [E=cache-control:max-age=86400]
### marker FAVICON end ###

</IfModule>
## LITESPEED WP CACHE PLUGIN – Do not edit the contents of this block! ##
# END LSCACHE