This means that the php server is configured with safe mode turned on in the php.ini file.
The Universal Email portion of CSS From builder that sends the email will not work on php servers where safe mode is enabled. With safe mode enabled, some php functions like set_time_limit() get disabled. Safe mode will need to be turned of in the php.ini file for the server.
to redirect to another page, go to the server behaviors panel (Window -> Server Behaviors). In the server behaviors lit, double click the universal email behavior to edit it, set the Go To page option to point to the page you would like to display after the email is sent.