Disabling WP Super Cach

I’m wondering if any one can give me some advice. I want to disable/delete my WP Super Cache 1.4.8 because it’s causing an issue with backing up (I’m using BUB 7.2.1) but for some reason I can not disable the plug in. When I select disable I get the following message:

Could not remove WP_CACHE define from /home2/viewto/public_html/wp-config.php. Please edit that file and remove the line containing the text ‘WP_CACHE’. Then refresh this page.

If I try to go to the settings page I receive this message:
Warning! Could not update /home2/viewto/public_html/wp-config.php! WPCACHEHOME must be set in config file.
Warning! /home2/viewto/public_html/wp-content/advanced-cache.php does not exist or cannot be updated.

1. If it already exists, please delete the file first.
2. Make /home2/viewto/public_html/wp-content writable using the chmod command through your ftp or server software. (chmod 777 /home2/viewto/public_html/wp-content) and refresh this page. This is only a temporary measure and you’ll have to make it read only afterwards again. (Change 777 to 755 in the previous command)
3. Refresh this page to update /home2/viewto/public_html/wp-content/advanced-cache.php

If that doesn’t work, make sure the file /home2/viewto/public_html/wp-content/advanced-cache.php doesn’t exist:

1. Open /home2/viewto/public_html/wp-content/plugins/wp-super-cache/advanced-cache.php$wp_cache_file in a text editor.
2. Change the text CACHEHOME to /home2/viewto/public_html/wp-content/plugins/wp-super-cache/
3. Save the file and copy it to /home2/viewto/public_html/wp-content/advanced-cache.php and refresh this page.

I’m using WP 4.7 and my theme is Inovado 4.6.5 and I’ve tried following the above instructions to no avail.
Thank you in advance for any help.Show less