t411 forum error

Fatal Error in PHP.trigger_error();
Smarty error: the $compile_dir '/home/t411/forum/cache/Smarty/compile' does not exist, or is not a directory.
The error occurred on or near: /home/t411/forum/library/vendors/Smarty-2.6.25/libs/Smarty.class.php
1109:      * @param integer $error_type
1110:      */
1111:     function trigger_error($error_msg, $error_type = E_USER_WARNING)
1112:     {
1113:         trigger_error("Smarty error: $error_msg", $error_type);
1114:     }
1115:
1116:
1117:     /**
Backtrace:
/home/t411/forum/library/vendors/Smarty-2.6.25/libs/Smarty.class.phpPHP::Gdn_ErrorHandler();
[/home/t411/forum/library/vendors/Smarty-2.6.25/libs/Smarty.class.php:1113] PHP::trigger_error();
[/home/t411/forum/library/vendors/Smarty-2.6.25/libs/internals/core.write_compiled_resource.php:20] Smarty->trigger_error();
[/home/t411/forum/library/vendors/Smarty-2.6.25/libs/Smarty.class.php:1451] PHP::smarty_core_write_compiled_resource();
[/home/t411/forum/library/vendors/Smarty-2.6.25/libs/Smarty.class.php:1274] Smarty->_compile_resource();
[/home/t411/forum/library/vendors/Smarty-2.6.25/libs/Smarty.class.php:1126] Smarty->fetch();
[/home/t411/forum/library/core/class.smarty.php:81] Smarty->display();
[/home/t411/forum/library/core/class.controller.php:1566] Gdn_Smarty->Render();
[/home/t411/forum/library/core/class.controller.php:1141] Gdn_Controller->RenderMaster();
[/home/t411/forum/library/core/class.pluggable.php:193] Gdn_Controller->xRender();
[/home/t411/forum/applications/vanilla/controllers/class.discussioncontroller.php:181] Gdn_Pluggable->__call();
[/home/t411/forum/applications/vanilla/controllers/class.discussioncontroller.php:181] DiscussionController->Render();
[/home/t411/forum/applications/vanilla/controllers/class.discussioncontroller.php:181] DiscussionController->Index();
[/home/t411/forum/library/core/class.dispatcher.php:322] PHP::call_user_func_array();
[/home/t411/forum/index.php:54] Gdn_Dispatcher->Dispatch();
Variables in local scope:
[error_msg] 'the $compile_dir \'/home/t411/forum/cache/Smarty/compile\' does not exist, or is not a directory.'
[error_type] 256
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