Plugin error

Anyone know how to fix this? I tried installing this plugin via ftp and via Plugins > Install new plugin and received this error:

Plugin could not be activated because it triggered a fatal error.

Fatal error: Class ‘WP_Widget’ not found in /vservers/annice/htdocs/wp-content/plugins/wp-email/wp-email.php on line 1312

Was thinking maybe it’s b/c I didn’t have latest version of WP so I tried installing and now I have a new problem…

I clicked the “WordPress 2.9.1 is available! Please update now.” link which I’ve never used – I usually use the auto upgrade plugin. It just sat there for a long, long while saying it is downloading from zip. I didn’t think it was working so I clicked Add New Plugin and installed the auto upgrade plugin and activated it successfully. However, I’m getting this error message after clicking the auto upgrade. I’ve never gotten this error before (is it b/c I didn’t wait for the other one maybe?):

Your server is running in safe mode. WPAU cannot continue in safe mode. Please ask your system administrator to change the setting to disble running in safe mode

Not sure how to fix this.

Called host and they fixed it. The upgrade fixed the problem. The plugin is working.