Crontab configuration tab gives whitescreen

The function supercron_standard_path() does not exist when the 'supercron_invocation_form' form is being built.

The form is called from hook_menu in supercron-main.inc
the function supercron_standard_path() also exists in supercron-main.inc so i am not sure why it cant be found.

I played for a while and some how the form started showing without errors even though i removed all my debug code!
so i uninstalled and re-installed and was back to the white screen of death on the config tab

it was as if during my debug/tests i visited some url or maybe posted the form which made it all come to life

perhaps it is to do with the paths that *seem* wrong (the module name gets added twice to everything)

my site is named 'sad' and is in my /applications/mamp/htdocs/sad folder as you'd expect
so the supercron module path is /applications/mamp/htdocs/sad/sites/all/modules/supercron

but supercron suggests this ... (note the double 'sad/sad/')

The supercron.php file should be copied from the /applications/mamp/htdocs/sad/sad/sites/all/modules/supercron directory to /applications/mamp/htdocs/sad/sad/; until that is done, your cron-driven tasks will not execute when scheduled to.

hope to get chance to look deeper later on