An unexpected error has occur please reload the page and try again

[Amolowe2021]

Describe the issue or problem
I am running the current version on my journal system and one day i login to my dashboard and on the submission page i received an error message that: an unexpected error has occurred, please reload the page and try again
when i check my error log i could see this message:
[13-Aug-2022 21:36:11 Africa/Lagos] Slim Application Error:
Type: Error
Message: Call to a member function getFullName() on null
File: /home/wnjmscom/public_html/journal/lib/pkp/classes/submission/reviewAssignment/ReviewAssignmentDAO.inc.php
Line: 453
Trace: #0 /home/wnjmscom/public_html/journal/lib/pkp/classes/submission/reviewAssignment/ReviewAssignmentDAO.inc.php(68): ReviewAssignmentDAO->_fromRow(Array)
#1 /home/wnjmscom/public_html/journal/lib/pkp/classes/submission/reviewAssignment/ReviewAssignmentDAO.inc.php(187): ReviewAssignmentDAO->_getReviewAssignmentsArray(‘SELECT r.*, r2…’, Array)
#2 /home/wnjmscom/public_html/journal/lib/pkp/classes/services/PKPSubmissionService.inc.php(690): ReviewAssignmentDAO->getBySubmissionId(59)
#3 /home/wnjmscom/public_html/journal/lib/pkp/classes/services/PKPSubmissionService.inc.php(308): PKP\Services\PKPSubmissionService->getReviewAssignments(Object(Submission))
#4 /home/wnjmscom/public_html/journal/lib/pkp/classes/services/PKPSubmissionService.inc.php(212): PKP\Services\PKPSubmissionService->getPropertyReviewAssignments(Object(Submission))
#5 /home/wnjmscom/public_html/journal/lib/pkp/classes/services/PKPSubmissionService.inc.php(297): PKP\Services\PKPSubmissionService->getProperties(Object(Submission), Array, Array)
#6 /home/wnjmscom/public_html/journal/lib/pkp/api/v1/_submissions/PKPBackendSubmissionsHandler.inc.php(160): PKP\Services\PKPSubmissionService->getBackendListProperties(Object(Submission), Array)
#7 [internal function]: PKPBackendSubmissionsHandler->getMany(Object(Slim\Http\Request), Object(APIResponse), Array)
#8 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/Handlers/Strategies/RequestResponse.php(40): call_user_func(Array, Object(Slim\Http\Request), Object(APIResponse), Array)
#9 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/Route.php(281): Slim\Handlers\Strategies\RequestResponse->__invoke(Array, Object(Slim\Http\Request), Object(APIResponse), Array)
#10 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\Route->__invoke(Object(Slim\Http\Request), Object(APIResponse))
#11 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/Route.php(268): Slim\Route->callMiddlewareStack(Object(Slim\Http\Request), Object(APIResponse))
#12 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/App.php(503): Slim\Route->run(Object(Slim\Http\Request), Object(APIResponse))
#13 /home/wnjmscom/public_html/journal/lib/pkp/classes/security/authorization/internal/ApiAuthorizationMiddleware.inc.php(77): Slim\App->__invoke(Object(Slim\Http\Request), Object(APIResponse))
#14 [internal function]: ApiAuthorizationMiddleware->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Slim\App))
#15 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(ApiAuthorizationMiddleware), Array)
#16 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Slim\App))
#17 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Slim\App))
#18 /home/wnjmscom/public_html/journal/lib/pkp/classes/security/authorization/internal/ApiCsrfMiddleware.inc.php(46): Slim\App->Slim{closure}(Object(Slim\Http\Request), Object(APIResponse))
#19 [internal function]: ApiCsrfMiddleware->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#20 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(ApiCsrfMiddleware), Array)
#21 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#22 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#23 /home/wnjmscom/public_html/journal/lib/pkp/classes/security/authorization/internal/ApiTokenDecodingMiddleware.inc.php(131): Slim\App->Slim{closure}(Object(Slim\Http\Request), Object(APIResponse))
#24 [internal function]: ApiTokenDecodingMiddleware->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#25 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(ApiTokenDecodingMiddleware), Array)
#26 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#27 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#28 /home/wnjmscom/public_html/journal/lib/pkp/classes/handler/APIHandler.inc.php(68): Slim\App->Slim{closure}(Object(Slim\Http\Request), Object(APIResponse))
#29 [internal function]: APIHandler->{closure}(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#30 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(Closure), Array)
#31 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#32 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#33 /home/wnjmscom/public_html/journal/lib/pkp/classes/handler/APIHandler.inc.php(127): Slim\App->Slim{closure}(Object(Slim\Http\Request), Object(APIResponse))
#34 [internal function]: APIHandler->{closure}(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#35 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(Closure), Array)
#36 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#37 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#38 /home/wnjmscom/public_html/journal/lib/pkp/classes/handler/APIHandler.inc.php(132): Slim\App->Slim{closure}(Object(Slim\Http\Request), Object(APIResponse))
#39 [internal function]: APIHandler->{closure}(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#40 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(Closure), Array)
#41 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#42 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#43 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\App->Slim{closure}(Object(Slim\Http\Request), Object(APIResponse))
#44 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/App.php(392): Slim\App->callMiddlewareStack(Object(Slim\Http\Request), Object(APIResponse))
#45 /home/wnjmscom/public_html/journal/lib/pkp/classes/handler/APIHandler.inc.php(124): Slim\App->process(Object(Slim\Http\Request), Object(APIResponse))
#46 [internal function]: APIHandler->{closure}(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#47 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(Closure), Array)
#48 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#49 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#50 /home/wnjmscom/public_html/journal/lib/pkp/classes/handler/APIHandler.inc.php(132): Slim\App->Slim{closure}(Object(Slim\Http\Request), Object(APIResponse))
#51 [internal function]: APIHandler->{closure}(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#52 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array(Object(Closure), Array)
#53 [internal function]: Slim\DeferredCallable->__invoke(Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#54 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func(Object(Slim\DeferredCallable), Object(Slim\Http\Request), Object(APIResponse), Object(Closure))
#55 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\App->Slim{closure}(Object(Slim\Http\Request), Object(APIResponse))
#56 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/App.php(392): Slim\App->callMiddlewareStack(Object(Slim\Http\Request), Object(APIResponse))
#57 /home/wnjmscom/public_html/journal/lib/pkp/lib/vendor/slim/slim/Slim/App.php(297): Slim\App->process(Object(Slim\Http\Request), Object(APIResponse))
#58 /home/wnjmscom/public_html/journal/lib/pkp/classes/core/APIRouter.inc.php(115): Slim\App->run()
#59 /home/wnjmscom/public_html/journal/lib/pkp/classes/core/Dispatcher.inc.php(144): APIRouter->route(Object(Request))
#60 /home/wnjmscom/public_html/journal/lib/pkp/classes/core/PKPApplication.inc.php(362): Dispatcher->dispatch(Object(Request))
#61 /home/wnjmscom/public_html/journal/index.php(68): PKPApplication->execute()
#62 {main}
View in rendered output by enabling the “displayErrorDetails” setting.

[rcgillis]

Hello @Amolowe2021,

Can you please indicate your OJS version number as well (e.g. 3.3.0-11)

Thank you,

Roger
PKP Team