DB Error: Table './ajms_db/sessions' is marked as crashed and should be repaired

Stack Trace:

File: /home/ajms/public_html/lib/pkp/classes/session/SessionDAO.inc.php line 38
Function: DAO->retrieve("SELECT * FROM sessions WHERE session_id = ?", Array(1))

File: /home/ajms/public_html/lib/pkp/classes/session/SessionManager.inc.php line 168
Function: SessionDAO->getSession("0udkca0f16782u77o5to5k6c26")

File: (unknown) line (unknown)
Function: SessionManager->read("0udkca0f16782u77o5to5k6c26")

File: /home/ajms/public_html/lib/pkp/classes/session/SessionManager.inc.php line 58
Function: session_start()

File: /home/ajms/public_html/lib/pkp/classes/session/SessionManager.inc.php line 129
Function: SessionManager->__construct(Object(SessionDAO), Object(Request))

File: /home/ajms/public_html/lib/pkp/classes/security/Validation.inc.php line 366
Function: SessionManager::getManager()

File: /home/ajms/public_html/lib/pkp/classes/core/PKPPageRouter.inc.php line 66
Function: Validation::isLoggedIn()

File: /home/ajms/public_html/lib/pkp/classes/core/Dispatcher.inc.php line 117
Function: PKPPageRouter->isCacheable(Object(Request))

File: /home/ajms/public_html/lib/pkp/classes/core/PKPApplication.inc.php line 247
Function: Dispatcher->dispatch(Object(Request))

File: /home/ajms/public_html/index.php line 68
Function: PKPApplication->execute()