matlab error or libsvm error with related to mex files

hey guys I am using libsvm and matlab 2011 from some time, now problem is it suddenly started to give me error about this mex files and it dont run again.Interesting thing is same program is running few times back but now its not working.error is as follows.%%%%%%%%%%%% Segmentation violation detected at Thu Mar 21 07:01:31 2013

.......then some stack trace files name.... This error was detected while a MEX-file was running. If the MEX-file is not an official MathWorks function, please examine its source code for errors. Please consult the External Interfaces Guide for information on debugging MEX-files. Caught MathWorks::System::FatalException

%%%%%%%%%%%%%%%%%% can anybody help me on this?I reinstalled libsvm but nothing changes.thanks in advance.tell me if you need more info

[Kaustubha Govind]

It's hard for us to really help with this type of issue. If you have the source code, you may way to debug your MEX-function, if you don't, you may need to contact the vendor of the MEX-file.

[karan dev]

Actually this is standard libsvm mex file and I didn't make any change in that so I think there may be not chance of error hopefully because it's very popular.So i think either my code or setup & installing with libsvm having error.