Calibre 1.48 doesn't run! :-(

Hi,
i have downloades the binaries of calibre 1.48 here:
https://download.calibre-ebook.com/1.48.0/

but it doesn't work:

[code]
$ ./calibre
WARNING: Failed to set default libc locale, using en_US.UTF-8
Traceback (most recent call last):
  File "site.py...