Does this caution need fixed? (newb)

FROM : Chris Paveglio
DATE : Thu Jul 03 18:40:03 2008

I have a loop that gets the user's home directory, and then adds a string to complete the file path for several files.

This line:
theSettings = [NSHomeDirectory() stringByAppendingPathComponent:[myPrefs objectAtIndex:i]];

gives me a caution sign when I compile. It says "assignment from distinct Objective C type", but the code works.
How important is it to fix that? Also, should my code be "caution free" as a sign of clean coding or can some cautions that don't affect functionality be dismissed?

Thanks,
Chris
Cocoa Newb, Applescript Vet