OMP Quick Submit Plugin unable to add Contributor

I am using OMP 3.4.0.5 and I am using OMP Quick Submit Plugin from here GitHub - ajnyga/quickSubmit at omp but when I use the plugin and go to add contributor, I get this error.

When I checked the error log, I found this:

[18-Jun-2024 15:53:54 Asia/Kolkata] PHP Fatal error: Uncaught Error: Class “APP\controllers\grid\users\author\form\AuthorForm” not found in /home4/mylibvq4/public_html/inkbound.org/lib/pkp/controllers/grid/users/author/AuthorGridHandler.php:352
Stack trace:
#0 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/controllers/grid/users/author/AuthorGridHandler.php(330): PKP\controllers\grid\users\author\AuthorGridHandler->editAuthor(Array, Object(APP\core\Request))
#1 [internal function]: PKP\controllers\grid\users\author\AuthorGridHandler->addAuthor(Array, Object(APP\core\Request))
#2 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/classes/core/PKPRouter.php(334): call_user_func(Array, Array, Object(APP\core\Request))
#3 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/classes/core/PKPComponentRouter.php(291): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(APP\core\Request), Array)
#4 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPComponentRouter->route(Object(APP\core\Request))
#5 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/classes/core/PKPApplication.php(388): PKP\core\Dispatcher->dispatch(Object(APP\core\Request))
#6 /home4/mylibvq4/public_html/inkbound.org/index.php(21): PKP\core\PKPApplication->execute()
#7 {main}
thrown in /home4/mylibvq4/public_html/inkbound.org/lib/pkp/controllers/grid/users/author/AuthorGridHandler.php on line 352
[18-Jun-2024 15:55:44 Asia/Kolkata] PHP Fatal error: Uncaught Error: Class “APP\controllers\grid\users\author\form\AuthorForm” not found in /home4/mylibvq4/public_html/inkbound.org/lib/pkp/controllers/grid/users/author/AuthorGridHandler.php:352
Stack trace:
#0 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/controllers/grid/users/author/AuthorGridHandler.php(330): PKP\controllers\grid\users\author\AuthorGridHandler->editAuthor(Array, Object(APP\core\Request))
#1 [internal function]: PKP\controllers\grid\users\author\AuthorGridHandler->addAuthor(Array, Object(APP\core\Request))
#2 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/classes/core/PKPRouter.php(334): call_user_func(Array, Array, Object(APP\core\Request))
#3 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/classes/core/PKPComponentRouter.php(291): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(APP\core\Request), Array)
#4 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPComponentRouter->route(Object(APP\core\Request))
#5 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/classes/core/PKPApplication.php(388): PKP\core\Dispatcher->dispatch(Object(APP\core\Request))
#6 /home4/mylibvq4/public_html/inkbound.org/index.php(21): PKP\core\PKPApplication->execute()
#7 {main}
thrown in /home4/mylibvq4/public_html/inkbound.org/lib/pkp/controllers/grid/users/author/AuthorGridHandler.php on line 352
[18-Jun-2024 16:05:14 Asia/Kolkata] PHP Deprecated: XSLTProcessor::setParameter(): Passing null to parameter #1 ($namespace) of type string is deprecated in /home4/mylibvq4/public_html/inkbound.org/lib/pkp/classes/xslt/XSLTransformer.php on line 355
[18-Jun-2024 16:22:57 Asia/Kolkata] PHP Fatal error: Uncaught Error: Class “APP\controllers\grid\users\author\form\AuthorForm” not found in /home4/mylibvq4/public_html/inkbound.org/lib/pkp/controllers/grid/users/author/AuthorGridHandler.php:352
Stack trace:
#0 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/controllers/grid/users/author/AuthorGridHandler.php(330): PKP\controllers\grid\users\author\AuthorGridHandler->editAuthor(Array, Object(APP\core\Request))
#1 [internal function]: PKP\controllers\grid\users\author\AuthorGridHandler->addAuthor(Array, Object(APP\core\Request))
#2 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/classes/core/PKPRouter.php(334): call_user_func(Array, Array, Object(APP\core\Request))
#3 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/classes/core/PKPComponentRouter.php(291): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(APP\core\Request), Array)
#4 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPComponentRouter->route(Object(APP\core\Request))
#5 /home4/mylibvq4/public_html/inkbound.org/lib/pkp/classes/core/PKPApplication.php(388): PKP\core\Dispatcher->dispatch(Object(APP\core\Request))
#6 /home4/mylibvq4/public_html/inkbound.org/index.php(21): PKP\core\PKPApplication->execute()
#7 {main}
thrown in /home4/mylibvq4/public_html/inkbound.org/lib/pkp/controllers/grid/users/author/AuthorGridHandler.php on line 352

Please guide what to do