DSP tutorial parameter problem

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This usually happens when something else has already gone wrong. If you look in the MATLAB console window can you see any other error messages?

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There were some messages on the MATLAB console window, but now the same message doesnt appear anymore ,instead for some unknown reason, I have:

" MATLAB error message: Unexpected Standard exception from MEX file. What() is:Exception thrown by JniStubs : java.lang.NullPointerException"

and

"Error in 'untitled/comparator' (matlab:das_dv_hyperlink('das','mdl','untitled/comparator')) while executing C MEX S-function 'sGeneric', (mdlInitializeSampleTimes), at time 0." when I try to simulate my model.

On the MATLAB console window I get:

"Warning: The model 'untitled' does not have continuous states, hence

Simulink is using the solver 'VariableStepDiscrete' instead of solver

'ode45'. You can disable this diagnostic by explicitly specifying a

discrete solver in the solver tab of the Configuration Parameters

dialog, or by setting the 'Automatic solver parameter selection'

diagnostic to 'none' in the Diagnostics tab of the Configuration

Parameters dialog."

Here is the attached model file...I dont know what to do...Is the DSP builder installation corrupt?

Your design is invalid as you haven't delimited the synthesizable part of your design from the non-synthesizable part (i.e. your testbench). You need to add DSP Builder Input and Output blocks around the synthesizable part.

Chapter 2 of http://www.altera.com/literature/hb/dspb/hb_dspb_std.pdf (http://www.altera.com/literature/hb/dspb/hb_dspb_std.pdf) should help.