vsim-3170 error: Could not find...while simulating Altera NCO IP

Hi ,

I am quite new to Altera (Xilinx /Actel guy up to date) and I am trying to simulate an Altera NCO IP with frequency modulation input to see its frequency resolution performance.

So, I generated the IP with the Megawizard (Quartus II 9.0 sp2), wrote a simple testebench that modifies the phase increment and the frequency modulation input and the following .do file:

# ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++#  Compile sources & test# ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
vcom -work work -nologo -novopt NCO_CORDIC.vho 
vcom -work work -nologo tb_dds_cordic.vhd 
# ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++#  Start simulator# ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
vsim  {work.tb_dds_cordic(test)} 
      +notimingchecks 
	  -novopt 
      -t ps \  
add log -r *
set StdArithNoWarnings 1
run 0.0 ns;
set StdArithNoWarnings 0# --------------------------
do wave_dds_chirp.do
run 50000 us;

I am running Modelsim 6.5b PE . When I run the simulation , the two files compile but I get the error: ** Error: (vsim-3170) Could not find 'C:\FPGA\DDS\work. '. But in the work folder there are the .dbs , .dat files (output of the compile process). Any hint on what could be going on here??

Regards

zermelo