how can I fix error while loading shared libraries: libalteracl.so: wrong ELF class: ELFCLASS64

Did you get to any clue with it?

I have similar problem with my DE10-nano. The "libalteracl.so" either with 18.1 or 16.1 images, using the included executables. Below the complete log...

root@socfpga:~# ls -l
total 28
-rw-r--r-- 1 root root 225 Apr 27 2016 README
drwx------ 2 root root 4096 Jan 24 2017 boardtest
drwx------ 2 root root 4096 Apr 27 2016 hello_world
-rw-r--r-- 1 root root 279 Apr 16 2014 init_opencl.sh
drwxr-xr-x 7 root root 4096 Oct 5 2015 opencl_arm32_rte
drwx------ 2 root root 4096 Jan 24 2017 swapper
drwx------ 2 root root 4096 Jan 24 2017 vector_add
root@socfpga:~# sh init_opencl.sh
root@socfpga:~# cd boardtest/
root@socfpga:~/boardtest#
root@socfpga:~/boardtest#
root@socfpga:~/boardtest# ls
boardtest.aocx boardtest_host
root@socfpga:~/boardtest# ./boardtest_host
./boardtest_host: error while loading shared libraries: libalteracl.so: cannot open shared object file: No such file or directory