[f4aii]

I made the mistake of using my desktop PC that contains other libraries in addition to weatherduino. IDE chooses the wrong library.

I still have the error message for line 124 in the D_LCD tab,
must be fixed:
lcd.print(TX_Unit [SRUV_OutUnit] .SolarRad);
and put:
lcd.print (TX_Unit [UV_OutUnit] .SolarRad);
I have no other errors now.

Too bad the error messages are so little understandable for beginners like me.
Thanks for your help.