wordpress 5.5 errors

After WordPress 5.5 update, I’m facing an error on my blog post. The error says “Notice: rest_validate_value_from_schema was called incorrectly. The “type” schema keyword for is required. Please see Debugging in WordPress for more information. (This message was added in version 5.5.0.) in /home/smartga2/public_html/wp-includes/functions.php on line 5225″. This error continues till half page and then the original content of my post starts. I deactivated plugins and checked, it resolved the error. Then I deactivated the plugin that was causing the error but I need that plugin, it’s important. Later I contacted the plugin developer and he said that the plugin works fine with WordPress 5.5 but for me it doesn’t. Can you please help me out to know what that error actually is?