Error in starting guiMainForm.tcl

Hello all,

Could you please help me solving the following error?

I have installed ET_12.10 on a 64-bit CentOS 6, but when I want to rum it I face the following error:

[USER@hostname Work_directory]$ et
Encounter(R) Test and Diagnostics 12.1.102 May 21, 2013 (linux26_64 ET121)
Starting <Cadence Installation path>/ET_12/tools.lnx86/tb/tcl/main/guiMainForm.tcl
<Cadence Installation path>/ET_12/tools.lnx86/tb/bin/64bit/ILMserver: error while loading shared libraries: libXm.so.3: cannot open shared object file: No such file or directory

I thought the package libXm.so.3 is not installed. So I used yum to install it and it said that it is already installed.

Then I checked the file ILMserver with ldd command and I got the following:

[USER@hostname Work_directory]$ ldd <Cadence Installation path>/ET_12/tools.lnx86/tb/bin/64bit/ILMserver
    linux-vdso.so.1 =>  (0x00007ffe8288f000)
    libXm.so.3 => not found
    libXt.so.6 => /usr/lib64/libXt.so.6 (0x0000003701e00000)
    libc.so.6 => /lib64/libc.so.6 (0x00000036f5200000)
    libX11.so.6 => /usr/lib64/libX11.so.6 (0x00000036f8a00000)
    libSM.so.6 => /usr/lib64/libSM.so.6 (0x0000003700e00000)
    libICE.so.6 => /usr/lib64/libICE.so.6 (0x0000003701200000)
    /lib64/ld-linux-x86-64.so.2 (0x00000036f4e00000)
    libxcb.so.1 => /usr/lib64/libxcb.so.1 (0x00000036f8e00000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00000036f5a00000)
    libuuid.so.1 => /lib64/libuuid.so.1 (0x0000003700200000)
    libXau.so.6 => /usr/lib64/libXau.so.6 (0x00000036f8600000)
[USER@hostname Work_directory]$

It is strange, while the package is installed ILMserver do not have access to libXm.so.3.

Thanks in advance for your help.

Regards,
Iman