Don’t post secret server info on the Internet, hackers Love it.
Delete that image, copy the error text, edit it to hide the paths, for example:
ALLOWEDPATHS in USERPATH/wp-content/plugins/wp-super-cache/wp-cache.php in line 65
When you’re posting support requests, only post the text with the full file paths obscured.
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To fix your problem:
Line 65 (in Version 1.4.2) is
include(WPCACHEHOME . 'wp-cache-base.php');
Replace the bad path with the Good path, from
in GOODPATH/wp-content/plugins/wp-super-cache/wp-cache.php on line 65
How do you make that change?
In Settings, WP Super Cache, Advanced tab, click “Restore Default Configuration” at the bottom of the screen.
Now check in your wp-config.php file, that the line with
define( 'WPCACHEHOME', '/BADPATH/wp-content/plugins/wp-super-cache/' );
is correct,
define( 'WPCACHEHOME', '/GOODPATH/wp-content/plugins/wp-super-cache/' );
including the leading and trailing slash, and single slashes (no missing or double slashes). If not, fix it.