jos-Error: Unable to load document class

JSite -> render() @ /usr/home/afrikable/www/index.php:51
JDocumentHTML -> parse() @ /usr/home/afrikable/www/includes/application.php:256
JDocumentHTML -> _fetchTemplate() @ /usr/home/afrikable/www/libraries/joomla/document/html/html.php:414
JDocumentHTML -> _loadTemplate() @ /usr/home/afrikable/www/libraries/joomla/document/html/html.php:588
require() @ /usr/home/afrikable/www/libraries/joomla/document/html/html.php:531
include() @ /usr/home/afrikable/www/templates/afrikable/component.php:2
T3Template -> render() @ /usr/home/afrikable/www/templates/afrikable/index.php:5
T3Template -> getBuffer() @ /usr/home/afrikable/www/plugins/system/jat3/jat3/core/template.php:795
JDocumentHTML -> getBuffer() @ /usr/home/afrikable/www/plugins/system/jat3/jat3/core/template.php:1676
JDocument -> loadRenderer() @ /usr/home/afrikable/www/libraries/joomla/document/html/html.php:339
JError :: raiseError() @ /usr/home/afrikable/www/libraries/joomla/document/document.php:926
JError :: raise() @ /usr/home/afrikable/www/libraries/joomla/error/error.php:251
JError :: throwError() @ /usr/home/afrikable/www/libraries/joomla/error/error.php:176
call_user_func_array() @ /usr/home/afrikable/www/libraries/joomla/error/error.php:214
JError :: handleCallback()
call_user_func() @ /usr/home/afrikable/www/libraries/joomla/error/error.php:765
plgSystemRedirect :: handleError()
JError :: customErrorPage() @ /usr/home/afrikable/www/plugins/system/redirect/redirect.php:122
JDocument :: getInstance() @ /usr/home/afrikable/www/libraries/joomla/error/error.php:785
JError :: raiseError() @ /usr/home/afrikable/www/libraries/joomla/document/document.php:293
JError :: raise() @ /usr/home/afrikable/www/libraries/joomla/error/error.php:251