user19468: When I plug the USB cable to my Arduino and try to upload a sketch I get thtis error:
avrdude: ser_open(): can't open device "/dev/cu.usbmodem1411": No such file or directory
ioctl("TIOCMGET"): Inappropriate ioctl for device

when I go to Tools > ports I can't find the USB port.
The Arduino still working and green ligh is on, so what is the problem exactly?

user19322: Have heard of similar problems with Mac. Not a Mac user myself. Sometimes the Arduino can somehow trigger a current fault in the USB of Mac's and will need to be shut down and rebooted for it to work again.
Try rebooting your Mac.
If you have a cheap chinese Arduino you might need other drivers for it. Check what chip you have closest to the usb connector.

19468: <p>When I plug the USB cable to my Arduino and try to upload a sketch I get thtis error:</p>

<pre><code>avrdude: ser_open(): can't open device "/dev/cu.usbmodem1411": No such file or directory
ioctl("TIOCMGET"): Inappropriate ioctl for device
</code></pre>

<p>when I go to Tools > ports I can't find the USB port.
The Arduino still working and green ligh is on, so what is the problem exactly?</p>
 19322: <p>Have heard of similar problems with Mac. Not a Mac user myself. Sometimes the Arduino can somehow trigger a current fault in the USB of Mac's and will need to be shut down and rebooted for it to work again.</p>

<p>Try rebooting your Mac.</p>

<p>If you have a cheap chinese Arduino you might need other drivers for it. Check what chip you have closest to the usb connector.</p>
