ios - Instance method xyz not found (return type defaults to id)? -

i facing issue method, have using other nsstring , working fine.

see image.

enter image description here

here html nsstring, have used in other project, clone of this, working fine there, wrote this, working fine in project,

html = [html stringbyconvertinghtmltoplaintext];

but here in method , both ways giving warning. mean , how can solve ?

if htmlis typed id, know it's in fact nsstring, try casting nsstringand call selector there (id type nsstring).

that said, reported error occurs when method not declared in header file (https://stackoverflow.com/a/13154244/865688). did forget #import?

Brazell