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I am trying to learn altium.I just placed stm32f407vg microcontroller and one resistor these gives me error as in the picture :

(Failed to add the class and unknown pin error) http://oi68.tinypic.com/28hzbeu.jpg

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  • \$\begingroup\$ do you have a footprint defined for the resistor? \$\endgroup\$ – Peter Bennett Dec 6 '17 at 7:24
  • \$\begingroup\$ yes I am actually using standary altium Res3 \$\endgroup\$ – Qwe Qwe Dec 6 '17 at 7:54
  • \$\begingroup\$ Probably the footprint is not defined for it. Open Footprint Manager window via Tools -> Footprint Manager menu item. In the window, find and select the resistor from the Component List to the left then see if there's a footprint is defined or not. \$\endgroup\$ – Rohat Kılıç Dec 6 '17 at 8:32
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The resister footprint is not matching with your schematic.In the schematic, the resistor R1 terminals were named like R1-1 and R1-2.But, footprint pads name not 1 and 2.Thats the problem.

Go to the corresponding library and Edit the footprint pad name.Then it will be Okay.

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