MuleException: liblwjgl.so: wrong ELF class: ELFCLASS32

[leolo]

Hi,
I'm using a Linux 64 bit machine. I downloaded and extracted the Linux Files, but I get this error, when running ./mule.sh (it pops up in a dialog titled "Planet M.U.L.E. Error"):
"MuleException
somedirectory/mule/data/lib/liblwjgl.so: somedirectory/mule/data/lib/liblwjgl.so: wrong ELF class: ELFCLASS32 (Possible cause: architecture word width mismatch)
Please run mule.sh to start the game.
If the problem persists, please reinstall the program."
I attach the log_init.txt...
What can I do?
thanks in advance,
leolo

[Analog Kid]

This blog post suggests that it's a 32 vs 64 bit problem.

http://vsingleton.blogspot.ca/2012/03/wrong-elf-class-elfclass32-possible.html

However, I have not yet been able to get the "fix" to work.

Considering that this is still a bug after the blog post was from 2012 and the post I am replying to here was from 2014 tells me that Planet MULE is an abandoned project.