I'm running SwiftKey also and I don't believe I've gotten this error. Does it only occur when you reboot?
Yes, only on reboot according to most of the "chatter", but there are a few reports of it causing some other problems.
Why are people so agitated about this issue on the Swiftkey forum? As far as I have been able to determine, the bug has absolutely no functional consequences: it is just a message that gets displayed once when you reboot.