help with installation

[HP Wei]

I built and installed Erlang on a
Sun (Solaris 5.8 with gcc) in my office.
Everything run ok after I invoke it with 'erl'
-- I can do 'toolbar:start().'

However, after I copied the whole directory of ~/erlang/...
onto the Sun machine (Solaris 5.8) at home,  I had the following
problem.

Invoking erl is ok.  I can get into the interpreter and
run 'string:tokens(...).'.
But 'toolbar:start().' give me the error message:
** exited: {startup_timeout,toolbar} **

Perhaps, some setting is not right. Or some libraries are missing.
Could someone tell me what is  missing on my home machine ??

Thanks,
HP