strange error message with tuplet

[Stefan Thomas]

Dear lilypond-users,
when compiling one of my scores I get the following error message,
which I don't understand:

musik/musik_ab115.ly:63:16: warning: No tuplet to end
 s8\fp\<  s\f\>
                \times 4/6 { s32*5\p\< s 32\!}  \pedtrem  s4...\ff
\startTextSpan s32 \stopTextSpan  }%lautleise 115-118
Why  there is no "no tuplet to end?