Hi;
In the following of [this question](https://easyeda.com/forum/topic/Why-can-not-add-GND-in-EasyEDA-Simulation-mode-This-circuit-does-not-have-GND-Please-select-GND-from-the-circuit-tool-to-add-to-the-circuit-2bd13be63f504ec68b2401717c9f2edc) i can not simulate this circuit:
[https://easyeda\.com/editor\#mode=sim\,id=\|362b58197ad74b19b6333c38c7d8a098](https://easyeda.com/editor#mode=sim,id=%7C362b58197ad74b19b6333c38c7d8a098)
I have used writing tools **NetFlag GND** as GND part like [this simulation](https://easyeda.com/andyfierman/555-timer-simulation) but i have [another problem and that is](https://easyeda.com/forum/topic/Circuit-Sheet-1-Fatal-Error-Unknown-subcircuit-called-in-xu1-u1-3-u1-2-volprobe1-lm7809l-ta3-tee-46f0759b08e44ea0b428bf84a900e536) :
> Circuit: \*\* Sheet\_1 \*\* Fatal Error: Unknown subcircuit called in: xu1
> u1\_3 u1\_2 volprobe1 lm7809l\-ta3\-tee
So it worked by [ using the 78XX in Regulator part like this](https://easyeda.com/editor#mode=sim,id=159679bb4bae460baca0f562db2247ec|03eda222e44e40ac91aae4c09fb44163|e89fc4c974714cd0b522615621da1138|6d2364456aca4744ace23724edbfc7b7) but don't working by 7809 regulator icon from that icon bar?!!
Thanks for your Attention.
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