I've been correcting errors that appeared in the Atmel Studio, but walking was unable to fix this ('ultoa' was not declared in this scope) have any idea what might be.
Most errors were due to pgmspace.h library here, that I use is newer and some Typedef that are in the code are deprecated in the library that use.
As you can see here:
<avr/pgmspace.h>: Program Space Utilities
Thank you
José Rodrigues