Platformio-core: avrdude: ser_open(): can't open device "\\.\COM4": Access is denied.

[5ynatra]

I'm trying to build my arduino project and upload it, but when the build commands commence, I get an error

avrdude: ser_open(): can't open device "\\.\COM4": Access is denied.

I tried running Atom itself as admin but that didn't seem to do the trick, any pointers?

[ivankravets]

Did you close all Terminal windows with Serial Port Monitor?

[5ynatra]

@ivankravets That seemed to do the trick, thanks! I had the arduino IDE Monitor open

[ela21ccc]

what do you mean by closing the serial monitor?

[ivankravets]

@ela21ccc just reconnect your board

[Mohit2183]

i am getting this error "avrdude: ser_open(): can't open device "\.\COM4": Access is denied." what to do , i have tried with reconnecting it too

I tried with various options and finally succeed to download with using Audrino ISP

[ivankravets]

It seems that this port is used by another other application. Try to disconnect it from other apps.

[Mohit2183]

thanks ivankravets

[jmcdaris]

I'm getting this same error. I think I've done all the things mentioned above and still no luck. What else can I try?

[Rultem]

jmcdaris, Did you solve it?

[tophat17]

I have no idea why but my issue when away after I closed Cura slicer. Make sure you don't have any programs on your computer open that eat all your ports.

[chubylive]

Yeah Cura hugs your serial port like no other. you can disable the USB printer plugin

[stadekawa]

Took too long to find this solution; closing Cura solved my issue. Thank you!

[PhilRabbittBJ]

Yep Cura was the culprit for me too :-)
Thanks.