You may be running with a Berkeley DB library different than the one your binaries were compiled against.
For future reference, don't send only the .log file but also the transcript of the svnadmin invocation (copy-paste it from your terminal). Andrej Kičina wrote on Thu, Oct 27, 2011 at 18:33:53 +0200: > Hello, > > I try to convert SVN repository from bdb to fsfs format. But when I try to > generate dump file, I get an error with description to send you the .log > file. Could you please tell me what could be wrong? Thanks. > > Best regards, > Andrej Kicina