Importing new posts from csv not working for me at all

When I try to import new posts from even the simplest CSV, the import progress indicator seems to show that the import was successful, but no posts get created and the “Manager” tab indicates no new rows were inserted. I even tried it with a very simple one-row CSV with these contents:

post_title,post_content,post_date,post_status,comment_status,ping_status,aioseo_description
This is a test title,This is test content,2023-11-27 13:41:20,draft,closed,closed,This is a test AIOSEO meta description

My site is on a server running PHP 8.2 and I have all the minimum requirements as indicated in the “Settings” tab of the plugin. I am not sure if it is related but for what it’s worth, these are the errors that I am seeing in my php error log:

[19-Jan-2024 02:13:14 UTC] PHP Warning: Undefined array key 0 in /home/user/public_html/wp-content/plugins/wp-ultimate-csv-importer/extensionModules/MappingExtension.php on line 59
[19-Jan-2024 02:13:40 UTC] PHP Warning: Undefined array key 0 in /home/user/public_html/wp-content/plugins/wp-ultimate-csv-importer/importExtensions/CoreFieldsImport.php on line 171
[19-Jan-2024 02:13:40 UTC] PHP Warning: Undefined array key 0 in /home/user/public_html/wp-content/plugins/wp-ultimate-csv-importer/importExtensions/ImportHelpers.php on line 207
[19-Jan-2024 02:13:40 UTC] PHP Warning: Undefined variable $post_values in /home/user/public_html/wp-content/plugins/wp-ultimate-csv-importer/importExtensions/ImportHelpers.php on line 313
[19-Jan-2024 02:13:40 UTC] PHP Warning: foreach() argument must be of type array|object, null given in /home/user/public_html/wp-content/plugins/wp-ultimate-csv-importer/importExtensions/AllInOneSeoImport.php on line 39