DB Error: MySQL server has gone away

Stack Trace:

File: /home/anais/public_html/lib/pkp/classes/navigationMenu/NavigationMenuItemDAO.inc.php line 52
Function: DAO->retrieve("SELECT * FROM navigation_menu_items WHERE path = ? and context_i...", Array(3))

File: /home/anais/public_html/lib/pkp/classes/services/PKPNavigationMenuService.inc.php line 575
Function: NavigationMenuItemDAO->getByPath("2", "article/view/520/144")

File: (unknown) line (unknown)
Function: PKP\Services\PKPNavigationMenuService->_callbackHandleCustomNavigationMenuItems("LoadHandler", Array(3))

File: /home/anais/public_html/lib/pkp/classes/plugins/HookRegistry.inc.php line 107
Function: call_user_func(Array(2), "LoadHandler", Array(3))

File: /home/anais/public_html/lib/pkp/classes/core/PKPPageRouter.inc.php line 188
Function: HookRegistry::call("LoadHandler", Array(3))

File: /home/anais/public_html/lib/pkp/classes/core/Dispatcher.inc.php line 134
Function: PKPPageRouter->route(Object(Request))

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

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

DB Error: MySQL server has gone away

Stack Trace:

File: /home/anais/public_html/lib/pkp/classes/session/SessionDAO.inc.php line 111
Function: DAO->update("UPDATE sessions SET user_id = ?, ip_address = ?, ...", Array(9))

File: /home/anais/public_html/lib/pkp/classes/session/SessionManager.inc.php line 185
Function: SessionDAO->updateObject(Object(Session))

File: (unknown) line (unknown)
Function: SessionManager->write("0kr7a48v2smdle12nepsgtpnk1", "")

File: (unknown) line (unknown)
Function: session_write_close()