The problem of installing MS5.5 in linux cluster(CentOS 6.0)

My operations system is CentOS Linux release 6.0 (Final)  Kernel \r on an \m.

And When I install the mis.lic ,the error shows as follows:

[guanzy@node01 bin]\$ ./lp_admin

/home/guanzy/Accelrys/LicensePack/linux/bin/rt_bin/lp_admin_gui: error while loading shared libraries: libSM.so.6: cannot open shared object file: No such file or directory

What's the matter ?how to deal with it ?

Any suggestions !!