fatal error

This is a memory limitation when your site contain thousand of posts. When the plugin try to build the re-order interface, querying the list full list will require more memory.
You should get in touch with the server admin and ask how to increase the allocated memory usage, increasing that to 164Mb or maybe 256Mb will make the fix.
As alternative, you can try the Advanced Post Types Order this contain a different method/code of building the lists which can process like 30-40k on such memory allocation without problem. Related help topic can be found at
https://www.ads-software.com/support/topic/re-order-not-showing-posts-under-posts-section?replies=4

Thanks for support
Good point for the memory limit, but I also want to take a look at Advanced Post Types Order