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Error: Ground (signal "0") of the simulator used

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The simulator must set a signal with the name "0". This signal has the potential 0 volt! This point of reference is necessary and obviously math. meaningful, since otherwise voltages e.g. V(Out) are not defined.

TARGET3001! translates (for the simulator) the signal with the name "GND" into "0", thus it cause a conflict/shortcircuit vs. "0" and GND, if also a signal with the name "0" is already present.

Exception: Subcktgenerator projects may use the signal "0" for some nodes of the subcircuit, but the entire subcircuit must be drawn only on the first schematic page (0 and GND will be shortcircuited).