Make all trac child tickets have the same headers and inherit fields

Hi,

Can you make the table headers for every parent ticket type: "type, status, owner, summary"

And can you make the child Inherited fields for every parent ticket type: "cc, version, keywords, component, milestone"

When I try to do this on:

I get the error:

"Warning: Error writing to trac.ini, make sure it is writable by the web server. Your changes have not been saved."