Error when calling "crossrefExportPlugin->exportXML" from Crossref Deposit Plugin

Dear all,

I ran into the following error and am having trouble generating the XML in order to deposit to Crossref.
I think it’s a potential bug in the Crossref Deposit Pluguin or the CrossRef XML Export Plugin, but please help me as soon as possible.

Error Message when calling “crossrefExportPlugin->exportXML” from Crossref Deposit Plugin is as follows,

[Thu Jan 13 00:51:13.426963 2022] [php7:notice] [pid 190566] [client xxx.xxx.xxx.xxx:49267] Slim Application Error:\nType: Exception\nMessage: *The selected object could not be converted.(This message is by machine translation.)* \nFile: /var/www/html/ops/lib/pkp/classes/plugins/ImportExportPlugin.inc.php\nLine: 181\nTrace: #0 /var/www/html/ops/classes/plugins/PubObjectsExportPlugin.inc.php(358): ImportExportPlugin->displayXMLValidationErrors()\n#1 /var/www/html/ops/plugins/generic/crossrefDeposit/CrossrefDepositPlugin.inc.php(67): PubObjectsExportPlugin->exportXML()\n#2 /var/www/html/ops/lib/pkp/classes/plugins/HookRegistry.inc.php(107): CrossrefDepositPlugin->depositOnPublish()\n#3 /var/www/html/ops/lib/pkp/classes/services/PKPPublicationService.inc.php(605): HookRegistry::call()\n#4 /var/www/html/ops/lib/pkp/api/v1/submissions/PKPSubmissionHandler.inc.php(786): PKP\\Services\\PKPPublicationService->publish()\n#5 [internal function]: PKPSubmissionHandler->publishPublication()\n#6 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/Handlers/Strategies/RequestResponse.php(40): call_user_func()\n#7 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/Route.php(281): Slim\\Handlers\\Strategies\\RequestResponse->__invoke()\n#8 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\\Route->__invoke()\n#9 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/Route.php(268): Slim\\Route->callMiddlewareStack()\n#10 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/App.php(503): Slim\\Route->run()\n#11 /var/www/html/ops/lib/pkp/classes/security/authorization/internal/ApiAuthorizationMiddleware.inc.php(77): Slim\\App->__invoke()\n#12 [internal function]: ApiAuthorizationMiddleware->__invoke()\n#13 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array()\n#14 [internal function]: Slim\\DeferredCallable->__invoke()\n#15 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func()\n#16 /var/www/html/ops/lib/pkp/classes/security/authorization/internal/ApiCsrfMiddleware.inc.php(46): Slim\\App->Slim\\{closure}()\n#17 [internal function]: ApiCsrfMiddleware->__invoke()\n#18 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array()\n#19 [internal function]: Slim\\DeferredCallable->__invoke()\n#20 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func()\n#21 /var/www/html/ops/lib/pkp/classes/security/authorization/internal/ApiTokenDecodingMiddleware.inc.php(121): Slim\\App->Slim\\{closure}()\n#22 [internal function]: ApiTokenDecodingMiddleware->__invoke()\n#23 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array()\n#24 [internal function]: Slim\\DeferredCallable->__invoke()\n#25 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func()\n#26 /var/www/html/ops/lib/pkp/classes/handler/APIHandler.inc.php(68): Slim\\App->Slim\\{closure}()\n#27 [internal function]: APIHandler->{closure}()\n#28 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array()\n#29 [internal function]: Slim\\DeferredCallable->__invoke()\n#30 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func()\n#31 /var/www/html/ops/lib/pkp/classes/handler/APIHandler.inc.php(127): Slim\\App->Slim\\{closure}()\n#32 [internal function]: APIHandler->{closure}()\n#33 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array()\n#34 [internal function]: Slim\\DeferredCallable->__invoke()\n#35 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func()\n#36 /var/www/html/ops/lib/pkp/classes/handler/APIHandler.inc.php(132): Slim\\App->Slim\\{closure}()\n#37 [internal function]: APIHandler->{closure}()\n#38 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array()\n#39 [internal function]: Slim\\DeferredCallable->__invoke()\n#40 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func()\n#41 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\\App->Slim\\{closure}()\n#42 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/App.php(392): Slim\\App->callMiddlewareStack()\n#43 /var/www/html/ops/lib/pkp/classes/handler/APIHandler.inc.php(124): Slim\\App->process()\n#44 [internal function]: APIHandler->{closure}()\n#45 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array()\n#46 [internal function]: Slim\\DeferredCallable->__invoke()\n#47 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func()\n#48 /var/www/html/ops/lib/pkp/classes/handler/APIHandler.inc.php(132): Slim\\App->Slim\\{closure}()\n#49 [internal function]: APIHandler->{closure}()\n#50 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/DeferredCallable.php(57): call_user_func_array()\n#51 [internal function]: Slim\\DeferredCallable->__invoke()\n#52 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(70): call_user_func()\n#53 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(117): Slim\\App->Slim\\{closure}()\n#54 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/App.php(392): Slim\\App->callMiddlewareStack()\n#55 /var/www/html/ops/lib/pkp/lib/vendor/slim/slim/Slim/App.php(297): Slim\\App->process()\n#56 /var/www/html/ops/lib/pkp/classes/core/APIRouter.inc.php(115): Slim\\App->run()\n#57 /var/www/html/ops/lib/pkp/classes/core/Dispatcher.inc.php(144): APIRouter->route()\n#58 /var/www/html/ops/lib/pkp/classes/core/PKPApplication.inc.php(362): Dispatcher->dispatch()\n#59 /var/www/html/ops/index.php(68): PKPApplication->execute()\n#60 {main}\nView in rendered output by enabling the "displayErrorDetails" setting.\n, referer: https://my-ops-server/ops/index.php/test/workflow/index/2/5

I am using with OPS 3.3.0.8.
I’m sorry if it has already been resolved. If so, please let me know the link to the solution.

Thanks in advance,