Hi @Saxmanpgh,
There's a whole page here dedicated on what to check:
If you see an audio and MIDI sync alert in Logic Pro for Mac
However, the fact that the message mentions exactly 48,000 Hz, then it's likely a device you're using is firmly stuck on 48 kHz and not following Logic/CoreAudio, but you don't say anything about what external gear you may be using with Logic...so can you please provide more info about your setup?
J.