[Dovecot] Dovecot 2.0.2 and Pigeonhole-0.2.0

I upgraded today to Dovecot 2.0.2 and Pigeonhole-0.2.0 based on debian lenny. Looked not to bad, but when I activated sieve in the lda section the following error appeared for each delivery

Sep 11 18:13:11 lda: Error: dlopen(/usr/local/lib/dovecot/lda/lib90_sieve_plugin.so) failed: /usr/local/lib/dovecot/lda/lib90_sieve_plugin.so: undefined symbol: tried_default_save Sep 11 18:13:11 lda: Fatal: Couldn't load required plugins

I found some hints regarding on old versoin of deliver, but it is the current one. Any ideas?

Thanks Matthias