passing signal through CIC filters

hi anybody, i want passing signal through cicfilters, but i am getting following error, even then i am executing the code from MATLAB help also.& i changed input to double--same problem is there.

??? Error using ==> mfilt.cicdecim.super_decimsecfilter The input data type, double, is different than the wordlength of the input as defined in the InputBitWidth property.***BOLD TEXT*.

anybody can help .Thanks in advance

[Wayne King]

please show the relevant code.