Code check for a measure error, please

[chip]

Hi, I'm back using lilypond after a couple months away. It's nice to be
back, unfortanately in the meantime, my hard drive crashed and I didn't
have all my old .ly files backed up anywhere. :( Oh, well, so I'm
starting over again.
Anyway, I'm working on a score and cannot find what cause of a measure
check error is. I've pasted the code below, with the results of running
lilypond on the file. 
Thanks,
Chip

-----------------------------------------------------
\version "2.2.0"
\include "english.ly"
\paper  {
    #(paper-set-staff-size (* 7 mm))
    linewidth = #(* mm 170)
    indent = 0\mm
    interscoreline = 5.\mm
    }
\header {
  title = "Cumbia de la Novela"
  composer = "Written by I don't know"
  opus = "Recorded by I don't know"
  instrument = "Trumpet 1"
  arranger = "Arr. \& Transcribed by Chip Wiegand"
  poet = "Cumbia"
}

\score {
  \notes 
  \relative c''
  \transpose f g''
  {
  \set Score.skipBars = ##t
  \time 2/4
  \clef treble
  \key f \major
  % Intro 8bar rest
  R2*8
  % First horn chorus
  \repeat volta 2 {
  r8  ef16-- ef-. g8-- ef16 g ~
  g8. ef16 d8-- c-.
  r8 d16-- d-. f8-- d16 f ~
  f8. d16 c8-- bf,-.
  r8 c16-. c-. ef8-- c16 ef }
  \alternative {
  {ef8. c16 ef8-- c-. d8. b,16 g,4 ~
  g,2}
  {d4 ~ d16 g,16 b,16 d16
  g8-> g8-> r4}
  }
  % First vocal chorus
  R2*2
  r4 r16 g, g, af,
  g,4-- r4
  R2*2
  r4 r16 g, g, af,
  bf,4-- d--
  ef-- r
  R2*2
  r16 f16.[ ef16] d8--[ bf,--]
  c2
  R2*1
  r4 r16 g, bf, d
  g4-- f--
  ef2
  R2*2
  r16 d16.[ ef16] f8--[ d--]
  c2
  R2*1
  r4 r16 g, bf, d
  g8-> g-> r4
  }
}
-------------------------------------------------------
bash-2.05b$ lilypond lilytest.ly
lilypond (GNU LilyPond) 2.2.2
Running lilypond-bin...
Now processing `lilytest.ly'
Parsing...
Interpreting music... [8][16]
/usr/home/chip/lilytest.ly:54:2: warning: barcheck failed at: 15/32:

  r4 r16 g, bf, d

/usr/home/chip/lilytest.ly:61:2: warning: barcheck failed at: 7/16:

  r4 r16 g, bf, d
[20]
/usr/home/chip/lilytest.ly:54:2: warning: unbound spanner
`MultiMeasureRest':

  r4 r16 g, bf, d

/usr/home/chip/lilytest.ly:54:2: warning: unbound spanner
`MultiMeasureRestNumber':

  r4 r16 g, bf, d

Preprocessing graphical objects...
Calculating line breaks... [3][6][9][12][15][18]
programming error: I'm empty. Can't align on self
Continuing; crossing fingers

paper output to `lilytest.tex'...
writing header field `instrument' to `lilytest.instrument'...
writing header field `composer' to `lilytest.composer'...
writing header field `title' to `lilytest.title'...
writing header field `arranger' to `lilytest.arranger'...
writing header field `poet' to `lilytest.poet'...
writing header field `opus' to `lilytest.opus'...


Analyzing lilytest.tex...
Running ...
Running dvips...
Running ps2pdf...
DVI output to `lilytest.dvi'...
PDF output to `lilytest.pdf'...
PS output to `lilytest.ps'...
bash-2.05b$