IBrokers

Hello,
Can't get historical data using IBorkers package.
IB is in demo mode, but works well (quotes are showing).
I followed instructions (as of local.host trusted & API enables Activex)
Here is my output:

tws=twsConnect()
tws

<twsConnection at 20081201 17:41:57 CET >

fut=twsFuture("ZF","ECBOT","20090331")  #5 years T Notes ech MAR 2009
x=reqHistoricalData(tws,fut,barSize="1 day",duration="1 W") # 1 week of

data in demo mode     
waiting for TWS reply .....

then, it hang on for long, with hour glass as mouse pointer, and nothing
happen.

What is wrong ?

TY 4 any help,

Arno