That question can't be answered because you have not provided enough information. Take a
look over here:
There are many links in there that you will probably find useful over time. Specific to
this issue, do a string search on "problem report" in there. Click the 2 links you will
find, read up on what constitutes a proper problem report, & follow the advice. Once you
have posted a proper problem report, somebody (not necessarily me) should be able to help
you. Please do post a proper problem report. Don't just drop your question here & run
away. You asked a question. You've gotten answer. Now follow up.