error in file log with arduino mega & stellarium

Hello, I'm new here.
I have a problem with stellarium (software open source)
I connected Arduino and I wrote a small sketch to show the pattern of the (virtual) telescope at a fixed point in stellarium. Everything works, but the log file (log_TelescopeServer1) has this error:

Connection::performWriting: writeNonblocking(5) returned 5; #:GD#
Connection::performReading: readNonblocking returned 7; +45*00#
Lx200CommandGetDec::readAnswerFromBuffer: error: degree sign expected

You can see step by step what I did to this address:

Unfortunately at the moment it is only in Italian, but google should not be difficult traslate to english.
I can not understand what causes this error.
thanks,
Ezio

maybe better post it on the Italian subsection as there are the most people that can read the problem