Edit config/config.ini and set
debug.error_reporting = E_ALL phpSettings.display_startup_errors = 1 phpSettings.display_errors = 1
Edit config/config.ini and set
debug.error_reporting = 0 phpSettings.display_startup_errors = 0 phpSettings.display_errors = 0
Also refer no_data_showing_the_the_grid_pages_ie._manage_invoices_products_etc for information of setting the error reporting level for you php install
