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2.I try to build a 8051 design,but it always says MCS8051.dll failed to authorize when I simulate it.why? While you cannot create new designs 'from scratch' with the demo version, you are allowed to change the code into the micro. This gives you a chance to taste the simulator. In order to work wit...

This the solution (albeit simple).
Label one of the two C1 nets (which one is unimportant) with IC=0. If you know Spice then you should know why...

I think you are a little vague. What about if we can get your schematic attached here ?

A sneak preview of the new simulation log. Of course it will make you navigating up to the component that generates the error.