convert MuseScore to lilypond file format

I have had no success in converting MuseScore files into Lilypond format.

I have tried loading the resulting .ly file into Frescobaldi and get the following error log;

LilyPond [hornpipe.ly] starting (preview mode)...
Processing `hornpipe.ly'
Parsing...
hornpipe.ly:57:0: error: syntax error, unexpected \score

\score {
hornpipe.ly:60:38: error: unknown escaped string: `\AvoiceAA'
\context Voice = OApartAG
\AvoiceAA
hornpipe.ly:60:38: error: syntax error, unexpected STRING
\context Voice = OApartAG
\AvoiceAA
/usr/share/lilypond/2.12.2/ly/init.ly:63:66: error: syntax error, unexpected $end
(ly:parser-error parser (_ "expected error, but none found"))))

error: failed files: "hornpipe.ly"
LilyPond [hornpipe.ly] exited with return code 1.

I have also tried to process the resulting .ly file in a command terminal and get basically the same error report;

GNU LilyPond 2.12.2
Processing `hornpipe.ly'
Parsing...
hornpipe.ly:57:0: error: syntax error, unexpected \score

\score {
hornpipe.ly:60:38: error: unknown escaped string: `\AvoiceAA'
\context Voice = OApartAG
\AvoiceAA
hornpipe.ly:60:38: error: syntax error, unexpected STRING
\context Voice = OApartAG
\AvoiceAA
/usr/share/lilypond/2.12.2/ly/init.ly:63:66: error: syntax error, unexpected $end
(ly:parser-error parser (_ "expected error, but none found"))))

error: failed files: "hornpipe.ly"

I do not fully understand much of the Lilypond script so am dependent on programs such as Frescobaldi to help me edit Lilypond files, but somehow it seems MuseScore is not converting its files into a form that Lilypond will accept. I have however saved MuseScore files to xml format and successfully converted them to .ly files with the command musicxml2ly.