ise synthesis error - use of null array on signal X is not supported

[mlefter]

Hello,

Does anybody know how to deal with this error:

Use of null array on signal <rout_cb.parameters> is not supported.
INTERNAL_ERROR:Xst:cmain.c:3446:1.47

------------

subtype param is std_logic_vector(31 downto 0);
type param_array is array (0 to nrofsensors-1) of param;

type cb_registers is record
status_conf : std_logic_vector(31 downto 0);
cwindow : std_logic_vector(31 downto 0);
parameters : param_array;
end record;

signal rout_cb, ri_cb : cb_registers;

...

pr0 : process(rst, ahbsi, rout_amba, rout_cb) -- here comes the error

Thanks,
Mihai