Call to undefined function of_get_option()

Which file were you modifying to achieve this error?

no file!
only i changed my theme and saw that and when return to previous theme,no problem

It means that the function does not exist. So the theme Financio-www.98graph.com got some missing information. Your going to have to contact the creator the theme to get it fixed.

For me after I install the theme there is an error message on my dashboard “this theme require Option Framework” then you can click and install the plugin.

Fatal error: Call to undefined function of_get_option()

I have the same problem with this theme https://demo.fabthemes.com/kent/