red wire problem in npn, pnp and ground

i am trying to connect a combination of npn and pnp with their emitters connected to a ground but red wire appears. Moreover, the same happens when i try to connect a PWM generation arrangement with the common bases of both transistors. The output of this bjt arrangement is to be fed to an IGBT. Plz help

Answer 1

[Azzi Abdelmalek]

http://www.mathworks.com/help/physmod/sps/powersys/ug/building-and-simulating-a-simple-circuit.html#f10-23215