CCL: problem in running frequency

[partha kundu <partha1kundu]![gmail.com>]

 Dear All,
 I am running a frequency job for a large system which contains few
 fragment.
 I have used opt=verytight condition for optimization, still I am getting
 errors:
 
 Warning -- assumption of classical behavior for rotation
 
 may cause significant error
 
 Warning -- explicit consideration of 75 degrees of freedom as
 
 vibrations may cause significant error
 
 If I am only interested in frequency can I avoid those message, is it
 publishable ?  Gaussview is not able to show vibrational information .
 What
 does it mean ?
 
 Thanks in advance.
 
 Partha.