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Server error HTTP Status 500 when exporting lead sheet

I’m trying to export my project as a lead sheet but since yesterday evening I’m getting HTTP Status 500 and the file won’t export. When I have “Inlcude .ly with sheet music” (typo btw) turned on it does give me the .ly file, but when I try to compile that file it fails to compile. I added the log below:

Summary
 Processing `/Users/sylvian/Downloads/Love Never Felt So Good (topline en akkoorden).ly'
Parsing...
/Users/sylvian/Downloads/Love Never Felt So Good (topline en akkoorden).ly:59:194: error: syntax error, unexpected MULTI_MEASURE_REST
{\set Staff.extraNatural = ##f \override Lyrics.LyricSpace #'minimum-distance = #1.0 \clef treble  \key f \major  \time 4/4  \tempo  4 = 117  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  
                                                                                                                                                                                                 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 r4 f'8 e'16 d'16 c'4 r4 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 r2 r8 c''4. a'8 g'8 f'8 r8 r2 R1 R1 R1 R1 R1 R1 r4 f''8 e''8 c''4 r4 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 
/Users/sylvian/Downloads/Love Never Felt So Good (topline en akkoorden).ly:59:215: error: syntax error, unexpected MULTI_MEASURE_REST
{\set Staff.extraNatural = ##f \override Lyrics.LyricSpace #'minimum-distance = #1.0 \clef treble  \key f \major  \time 4/4  \tempo  4 = 117  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  
                                                                                                                                                                                                                      R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 r4 f'8 e'16 d'16 c'4 r4 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 r2 r8 c''4. a'8 g'8 f'8 r8 r2 R1 R1 R1 R1 R1 R1 r4 f''8 e''8 c''4 r4 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 
/Users/sylvian/Downloads/Love Never Felt So Good (topline en akkoorden).ly:59:260: error: syntax error, unexpected MULTI_MEASURE_REST
{\set Staff.extraNatural = ##f \override Lyrics.LyricSpace #'minimum-distance = #1.0 \clef treble  \key f \major  \time 4/4  \tempo  4 = 117  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  
                                                                                                                                                                                                                                                                   R1 R1 r4 f'8 e'16 d'16 c'4 r4 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 r2 r8 c''4. a'8 g'8 f'8 r8 r2 R1 R1 R1 R1 R1 R1 r4 f''8 e''8 c''4 r4 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 
/Users/sylvian/Downloads/Love Never Felt So Good (topline en akkoorden).ly:59:332: error: syntax error, unexpected MULTI_MEASURE_REST
{\set Staff.extraNatural = ##f \override Lyrics.LyricSpace #'minimum-distance = #1.0 \clef treble  \key f \major  \time 4/4  \tempo  4 = 117  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 r4 f'8 e'16 d'16 c'4 r4 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  
                                                                                                                                                                                                                                                                                                                                           R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 r2 r8 c''4. a'8 g'8 f'8 r8 r2 R1 R1 R1 R1 R1 R1 r4 f''8 e''8 c''4 r4 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 
/Users/sylvian/Downloads/Love Never Felt So Good (topline en akkoorden).ly:59:353: error: syntax error, unexpected MULTI_MEASURE_REST
{\set Staff.extraNatural = ##f \override Lyrics.LyricSpace #'minimum-distance = #1.0 \clef treble  \key f \major  \time 4/4  \tempo  4 = 117  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 r4 f'8 e'16 d'16 c'4 r4 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  
                                                                                                                                                                                                                                                                                                                                                                R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 r2 r8 c''4. a'8 g'8 f'8 r8 r2 R1 R1 R1 R1 R1 R1 r4 f''8 e''8 c''4 r4 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 
/Users/sylvian/Downloads/Love Never Felt So Good (topline en akkoorden).ly:59:392: error: syntax error, unexpected MULTI_MEASURE_REST
{\set Staff.extraNatural = ##f \override Lyrics.LyricSpace #'minimum-distance = #1.0 \clef treble  \key f \major  \time 4/4  \tempo  4 = 117  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 r4 f'8 e'16 d'16 c'4 r4 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  
                                                                                                                                                                                                                                                                                                                                                                                                       R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 r2 r8 c''4. a'8 g'8 f'8 r8 r2 R1 R1 R1 R1 R1 R1 r4 f''8 e''8 c''4 r4 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \temp
/Users/sylvian/Downloads/Love Never Felt So Good (topline en akkoorden).ly:59:425: error: syntax error, unexpected MULTI_MEASURE_REST
{\set Staff.extraNatural = ##f \override Lyrics.LyricSpace #'minimum-distance = #1.0 \clef treble  \key f \major  \time 4/4  \tempo  4 = 117  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 r4 f'8 e'16 d'16 c'4 r4 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1  \tempo  
                                                                                                                                                                                                                                                                                                                                                                                                                                        R1 r2 r8 c''4. a'8 g'8 f'8 r8 r2 R1 R1 R1 R1 R1 R1 r4 f''8 e''8 c''4 r4 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 
/Users/sylvian/Downloads/Love Never Felt So Good (topline en akkoorden).ly:59:518: error: syntax error, unexpected MULTI_MEASURE_REST
{\set Staff.extraNatural = ##f \override Lyrics.LyricSpace #'minimum-distance = #1.0 \clef treble  \key f \major  \time 4/4  \tempo  4 = 117  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 r4 f'8 e'16 d'16 c'4 r4 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 r2 r8 c''4. a'8 g'8 f'8 r8 r2 R1 R1 R1 R1 R1 R1 r4 f''8 e''8 c''4 r4 R1 R1 R1 R1  \tempo  
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
/Users/sylvian/Downloads/Love Never Felt So Good (topline en akkoorden).ly:59:539: error: syntax error, unexpected MULTI_MEASURE_REST
{\set Staff.extraNatural = ##f \override Lyrics.LyricSpace #'minimum-distance = #1.0 \clef treble  \key f \major  \time 4/4  \tempo  4 = 117  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 r4 f'8 e'16 d'16 c'4 r4 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 r2 r8 c''4. a'8 g'8 f'8 r8 r2 R1 R1 R1 R1 R1 R1 r4 f''8 e''8 c''4 r4 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  
                                                                                                                                                                                                                                                                                                                                                                                                                                                 
/Users/sylvian/Downloads/Love Never Felt So Good (topline en akkoorden).ly:59:584: error: syntax error, unexpected MULTI_MEASURE_REST
{\set Staff.extraNatural = ##f \override Lyrics.LyricSpace #'minimum-distance = #1.0 \clef treble  \key f \major  \time 4/4  \tempo  4 = 117  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 r4 f'8 e'16 d'16 c'4 r4 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1  \tempo  R1 r2 r8 c''4. a'8 g'8 f'8 r8 r2 R1 R1 R1 R1 R1 R1 r4 f''8 e''8 c''4 r4 R1 R1 R1 R1  \tempo  R1 R1 R1 R1  \tempo  R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1 R1  \tempo  
                                                                                                                                                                                                                                                                                                                                                                                                    
/Users/sylvian/Downloads/Love Never Felt So Good (topline en akkoorden).ly:34:1: error: errors found, ignoring music expression

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fatal error: failed files: "/Users/sylvian/Downloads/Love Never Felt So Good (topline en akkoorden).ly"

I fixed it. I think the cause was that I had multiple voices, because I removed the second voice and it worked again.