Error with new ferret

Hello there.

I get two different errors, after i installed the new ferret-version.
I havn’t seen any comments about changing the API, so there should be
no problem using acts_as_ferret as i did before:
File Not Found Error occured at <except.c>:117 in xpop_context
Error occured in fs_store.c:329 - fs_open_input
tried to open
“/home/app/current/config/…/index/production/client/_8km_1.del” but
it doesn’t exist:

/usr/lib64/ruby/gems/1.8/gems/ferret-0.11.2/lib/ferret/index.rb:285:in
`delete’

The file _8km.cfs does exist, but no _8km_1.del (the same happens with
_8km_0.del).

Then i have another error:
End-of-File Error occured at <except.c>:117 in xpop_context
Error occured in store.c:216 - is_refill
current pos = 0, file length = 0

/usr/lib64/ruby/gems/1.8/gems/ferret-0.11.2/lib/ferret/index.rb:285:in
`delete’

Somehow, both errors do happen at the same place.
By the way, my application is running on a Intel 64bit machine (Linux
app 2.6.18 x86_64 x86_64 x86_64 GNU/Linux), and i had some warning on
compiling about some wrong casts of pointers, could they cause some
problems?

Regards, Rainer