Hello Dears 

I'm trying to get Kamailio to log its CDRs (collected By ACC module ) to text file instead of a database so i used

modparam("acc", "db_url", "flatstore:/var/log/acc") and in each time kamailio trying to write on the text file i get the error :

" db_flatstore flat_new_connection() : not a directory"

so could any one guide me about how i have to create the database text file "acc"?  and what is the cause of the error i got  ?