Weird error message when I activated the Affiliate plugin

[AllegraSinclair]

Warning: unserialize() expects parameter 1 to be string, array given in /home/yourgian/public_html/yourpurposewithin.com/wp-content/plugins/wp-affiliate-platform/wp_affiliate_config_class.php on line 8

Warning: session_start() [function.session-start]: Cannot send session cache limiter – headers already sent (output started at /home/yourgian/public_html/yourpurposewithin.com/wp-content/plugins/wp-affiliate-platform/wp_affiliate_config_class.php: in /home/yourgian/public_html/yourpurposewithin.com/wp-content/plugins/wp-affiliate-platform/wp_affiliate_platform1.php on line 8

Whenever I activate this plugin I get this error message at the top of the plugin page. I am using Genesis by StudioPress, WordPress 3.2 and everything else works fine. When I deactivate the Affiliate plugin, the error disappears. I am also using eStore on this site.

When I deactivate W3 Total Cache, the error disappears.

Any ideas?

Allegra

[admin]

Please empty all cache from the W3 Total Cache plugin then do the following:

1. Deactivate and delete the currently installed version of the plugin(s).

2. Download a fresh build of the plugin(s) from here:

https://support.tipsandtricks-hq.com/update-request

3. Upload and activate this version of the plugin(s).

[Author]

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