Problem with Importer

I’m trying to import an xml file exported using WordPress export tool.

When I try to do Tools > Import, I get the following error.

I get a similar error when I try export this xml file and import into another site windowstechit.com.

I’m actually trying to export all posts and its relevant data from seotipsit.com to import to windowstechit.com using the Tools > Import functionality.

Its giving error on both seotipsit.com and also windowstechit.com.

I disabled all plugins.

I changed PHP version to 8.0.

I am using default 2024 theme.

Fatal error: Uncaught Error: The script tried to modify a property on an incomplete object. Please ensure that the class definition "Wpil_Model_Link" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide an autoloader to load the class definition in /home/u444657369/domains/seotipsit.com/public_html/wp-includes/formatting.php:5137 Stack trace: #0 /home/u444657369/domains/seotipsit.com/public_html/wp-includes/formatting.php(5132): map_deep() #1 /home/u444657369/domains/seotipsit.com/public_html/wp-includes/deprecated.php(4121): map_deep() #2 /home/u444657369/domains/seotipsit.com/public_html/wp-content/plugins/wordpress-importer/class-wp-import.php(894): wp_slash_strings_only() #3 /home/u444657369/domains/seotipsit.com/public_html/wp-content/plugins/wordpress-importer/class-wp-import.php(89): WP_Import->process_posts() #4 /home/u444657369/domains/seotipsit.com/public_html/wp-content/plugins/wordpress-importer/class-wp-import.php(65): WP_Import->import() #5 /home/u444657369/domains/seotipsit.com/public_html/wp-admin/admin.php(364): WP_Import->dispatch() #6 {main} thrown in /home/u444657369/domains/seotipsit.com/public_html/wp-includes/formatting.php on line 5137

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