I cannot find that airport LLER in the World Map.
That post reports that LLER is missing in MSFS but it is closed and it is not a bug report:
LLER is already reported missing in this main thread:
Could you please provide the steps you followed to get the METAR at LLER as shown in your screenshot ?
I have started a flight at an airport nearby LLYO. LLER does not show up neither in the METAR list but I can see fog in the background:
