Hi Gerd, The cause of the problem is that you have some nets where you have given one net two different netflags (i.e. netlabels). Here's an example: ![enter image description here][1] Click on net `GPIO0` in the Design Manager shows only one connection to GPIO0. Click on net`I2C_DISP_SCL` in the Design Manager shows all the other connections to GPIO0. * At present there is no way to define a netname alias in EasyEDA therefore you must choose one net name for the whole net. [1]: /editor/20160905/57cd3e7b7fea7.png