Asterisk 1.8.4 -- Function CDR not registered

I upgraded astersik 1.8.3 to 1.8.4 and getting following erros and asterisk crashes, please suggest?

[May 24 14:14:14] ERROR[9888]: pbx.c:3528 ast_func_read2: Function CDR not registered
[May 24 14:14:14] ERROR[9888]: pbx.c:3528 ast_func_read2: Function CDR not registered