error_opening_file WHILE TRYING TO COPY COURSE

 I am running Moodle 4.2+ with php 8.0 and MariaDB.
I am trying to copy course to reuse it again. However from wherever I try to reuse the course, I keep getting errors.
While trying to create copy from the Manage Courses and Categories, I get this error:
error/error_opening_file
On switching to debugging mode, the stack trace is as follows:
File:

Error code: error_opening_file
$a contents: /home1/chemtopp/moodledata310/temp/backup//2b4d40bd153bac2f9f5c37cefd48bb2e.log
* line 71 of /backup/util/loggers/file_logger.class.php: base_logger_exception thrown
* line ? of unknownfile: call to file_logger->__wakeup()
* line 97 of /backup/util/dbops/restore_controller_dbops.class.php: call to unserialize()
* line 502 of /backup/controller/restore_controller.class.php: call to restore_controller_dbops::load_controller()
* line 244 of /backup/util/helper/copy_helper.class.php: call to restore_controller::load_controller()
* line ? of unknownfile: call to copy_helper::{closure}()
* line 247 of /backup/util/helper/copy_helper.class.php: call to array_map()
* line 143 of /backup/util/helper/copy_helper.class.php: call to copy_helper::map_backupids_to_restore_controller()
* line 75 of /backup/util/ui/classes/output/copy_form.php: call to copy_helper::get_copies()
* line 214 of /lib/formslib.php: call to core_backup\output\copy_form->definition()
* line 5033 of /course/lib.php: call to moodleform->__construct()
* line 8064 of /lib/moodlelib.php: call to course_output_fragment_new_base_form()
* line 415 of /lib/external/externallib.php: call to component_callback()
* line ? of unknownfile: call to core_external::get_fragment()
* line 251 of /lib/external/classes/external_api.php: call to call_user_func_array()
* line 83 of /lib/ajax/service.php: call to core_external\external_api::call_external_function()

Error code: error_opening_file
$a contents: /home1/chemtopp/moodledata310/temp/backup//2b4d40bd153bac2f9f5c37cefd48bb2e.log
* line 71 of /backup/util/loggers/file_logger.class.php: base_logger_exception thrown
* line ? of unknownfile: call to file_logger->__wakeup()
* line 97 of /backup/util/dbops/restore_controller_dbops.class.php: call to unserialize()
* line 502 of /backup/controller/restore_controller.class.php: call to restore_controller_dbops::load_controller()
* line 244 of /backup/util/helper/copy_helper.class.php: call to restore_controller::load_controller()
* line ? of unknownfile: call to copy_helper::{closure}()
* line 247 of /backup/util/helper/copy_helper.class.php: call to array_map()
* line 143 of /backup/util/helper/copy_helper.class.php: call to copy_helper::map_backupids_to_restore_controller()
* line 75 of /backup/util/ui/classes/output/copy_form.php: call to copy_helper::get_copies()
* line 214 of /lib/formslib.php: call to core_backup\output\copy_form->definition()
* line 5033 of /course/lib.php: call to moodleform->__construct()
* line 8064 of /lib/moodlelib.php: call to course_output_fragment_new_base_form()
* line 415 of /lib/external/externallib.php: call to component_callback()
* line ? of unknownfile: call to core_external::get_fragment()
* line 251 of /lib/external/classes/external_api.php: call to call_user_func_array()
* line 83 of /lib/ajax/service.php: call to core_external\external_api::call_external_function()

Any help in resolving the issue is appreciated.

Thanks