Showing blank page

Dear Friend,

I am using cakephp 1.3 and when I added some new fields in database. I always remove cache file (app/tmp/cache/models) but when i refresh page browser show me a blank page.

After that I have change the value of debug to 2 page comes up after that I have reset the debug value to 0.

Problem is that. when some one open plugins page of my website those page not showing contents.
only header and footer showing, page content area is showing blank.

Please help me!