Custom error mode setting for layout pages.

To check the error in layout pages of 14 hive, if you just try to set the customerrormode = "off" in web.config. It doesn't work.

Layout folder in 14 hive contains one more we.config file and overwrite the customerrormode entry of app config .

To check the error in layout pages, set the customerrormode="Off" in the web.config of layout folder.