Orcad spice simulation time problem

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spice

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incorrect number of interface nodes

im trying to make an transient analysis on my circuit on orcad capture, i set the run time to 10 secs but it only simulates 250 µsecs! whats wrong?! how should i set the run time and max step size?
 

incorrect number of interface nodes for

Maybe there are a convergence problem during simulation, so the simulator stops.
 

error -- incorrect number of interface nodes for

Here run time is very large. reduce the run time to in order of ms or us then try.
and please solve my one problem. I am using OrCAD capture for making fulladder but i am unable to simulate it it is showing an error at the time of simulation the error is Incorrect number of interface nodes for X_U1A do u have any idea about this error.
 

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