Keychain not found

Ever since I installed Mac OS X 10.3, code named Panther, I've been hit with constant "Keychain not found" errors, one every minute it seems like. Nothing seems to solve the problem, and what's worse, the keychain it's looking for is right there where it should be in the Keychains folder. Is anyone else suffering this, and does anyone know how to fix it? It's driving me batty.