Error while Cancelling the Custom Profile field

[martinvivek]

You should really redirect before you start page output

line 902 of \lib\outputrenderers.php: call to debugging()
line 2819 of \lib\weblib.php: call to core_renderer->redirect_message()
line 305 of \local\elisprogram\customfieldpage.class.php: call to redirect()
line 400 of \local\eliscore\lib\page.class.php: call to customfieldpage->display_editfield()
line 356 of \local\eliscore\lib\page.class.php: call to elis_page->display()
line 232 of \local\elisprogram\index.php: call to elis_page->run()

Edit cancelled

Plugin 3.1.1.0
Moodle 3.1.2
PHP 7
Mysql 5.7