how to avoid errors related spectrum scope in simulink

I am using spectrum scope to observe output of simulink model. When i enable buffer input from spectrum scope, i kept buffer size as 1024 and buffer overlap as 64. But this combination of buffer input gives me following error pop up.

"Error evaluating registered method 'CheckParameters' of MATLAB S-Function 'sdspfscope2' in 'lab_5_test_1/Spectrum Scope1/Frame Scope'."

But when i kept buffer overlap as 0 that time i can't get this error due to welch periodogram. So please tell me what condition or values i need to keep for getting output.