DB Error: MySQL server has gone away

Stack Trace:

File: /home/l3geznoyj/public_html/journal/eduj/classes/subscription/InstitutionalSubscriptionDAO.inc.php line 570
Function: DAO->retrieve(" SELECT iss.subscription_id FROM institutional_subscrip...", Array(3))

File: /home/l3geznoyj/public_html/journal/eduj/classes/issue/IssueAction.inc.php line 138
Function: InstitutionalSubscriptionDAO->isValidInstitutionalSubscription("ec2-18-206-13-39.compute-1.amazonaws.com", "18.206.13.39", "1")

File: /home/l3geznoyj/public_html/journal/eduj/pages/article/ArticleHandler.inc.php line 307
Function: IssueAction->subscribedDomain(Object(Request), Object(Journal), "37", "747")

File: /home/l3geznoyj/public_html/journal/eduj/pages/article/ArticleHandler.inc.php line 99
Function: ArticleHandler->userCanViewGalley(Object(Request), "747", Null)

File: (unknown) line (unknown)
Function: ArticleHandler->view(Array(1), Object(Request))

File: /home/l3geznoyj/public_html/journal/eduj/lib/pkp/classes/core/PKPRouter.inc.php line 372
Function: call_user_func(Array(2), Array(1), Object(Request))

File: /home/l3geznoyj/public_html/journal/eduj/lib/pkp/classes/core/PKPPageRouter.inc.php line 233
Function: PKPRouter->_authorizeInitializeAndCallRequest(Array(2), Object(Request), Array(1), False)

File: /home/l3geznoyj/public_html/journal/eduj/lib/pkp/classes/core/Dispatcher.inc.php line 134
Function: PKPPageRouter->route(Object(Request))

File: /home/l3geznoyj/public_html/journal/eduj/lib/pkp/classes/core/PKPApplication.inc.php line 243
Function: Dispatcher->dispatch(Object(Request))

File: /home/l3geznoyj/public_html/journal/eduj/index.php line 68
Function: PKPApplication->execute()

DB Error: MySQL server has gone away

Stack Trace:

File: /home/l3geznoyj/public_html/journal/eduj/lib/pkp/classes/session/SessionDAO.inc.php line 111
Function: DAO->update("UPDATE sessions SET user_id = ?, ip_address = ?, ...", Array(9))

File: /home/l3geznoyj/public_html/journal/eduj/lib/pkp/classes/session/SessionManager.inc.php line 186
Function: SessionDAO->updateObject(Object(Session))

File: (unknown) line (unknown)
Function: SessionManager->write("ovj5mb7mi4rb1hg3d2dkoga2n0", "")

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