Hello all,
I have a piece of code that causes lilypond to say Drawing systems...lilypond: 
../flower/include/drul-array.hh:35: T& Drul_array<T>::at(Direction) [with T = 
double]: Assertion `d == 1 || d == -1' failed.
the code is as follows:
  \tuplet 3/2 4 { 
    <b b'>8 { \change Staff = "upper" } cess'''8[ b] ass e ess d
    { \change Staff = "lower" }
    cess b ass e ess }
in the left hand of of the piano staff. The right hand has the same notes but 
one octave higher. Appreciate any help,greetings
Samuel

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