Export bext file in Cubit 2023.4

I updated my Cubit to the Release version 2023.4. In this version, if I type
"export uspline 1 bext ‘file_name’,
it shows
“ERROR: Could not export the data to a file.
ERROR: uspline is not a valid type of file to be exported.”
However, this command is executable in version 2022.11. Is the latest version of Cubit unable to export bext format anymore?