Help - trouble with tuplets

[Karenee Herman]

I'm still a bit of a neophyte with Lilypond, so please forgive me if this seems simple!

I'm
trying to have triplets after a time signature change - but it just
won't work.  Somehow, the bass line ends up offset from the treble, pushing the last beat of measure three into measure four.  Also, a whole rest appears mixed in the bass line out of nowhere. 

So, my questions are: How do I get the bass to line up as it should?  And how do I get rid of the random whole rest?  I've attached the PDF, and the .ly stuff is below.

Thank you,

Karenee Herman

\version "2.12.2"

upper = \relative c'' {
\clef treble
\time 4/4
\key d \major

a8 a e' e fis fis e4
\time 3/4    d8 d cis cis b b
\time 4/4    a2 r2
R1 
}

lower = \relative c {
\clef bass
\time 4/4
\key d \major
    
R1
R1
\times 2/3 { <a e'>8 a' <a, e'> <a e'> a' <a, e'> <a d>4 <a d>8 } <a a'>4
\times 2/3 { <a e'>8 a' <a, e'> <a e'> a' <a, e'> <a d>4 <a d>8 } <a a'>4
}

\score {
\new PianoStaff <<
\set PianoStaff.instrumentName = #"Piano "
\new Staff = "upper" \upper
\new Staff = "lower" \lower
>>
\layout { }
\midi { }
}

Twinkle_no.pdf
Description: Adobe PDF document