i keep on getting that error, i dont know if it my nodemcu
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It’s a long shot but try shutting down the other instance of ESPHome web.
how can i do that please
Your screen shot shows more than one tab open with same page. It is the only clue you gave us. Otherwise wrong usb cable/ bad driver for espif
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okay bro will try to close the rest
I have the same issue with my NodeMCU. No other instances of Esphome connected.
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Did you figure it out? Running into the exact issue 
Tried reinstalling all drivers, see if that changes anything but unfortunately it didn’t.
Yeah I tried it with an esp8266 D1 mini, even on 2 different computers I couldn’t get it working. Messed around for hours. Mine has a dent on the esp8266 chip from shipping, but it worked just fine for previous projects.
Final I gave up and just tried it with an esp8266 NodeMCU v3 and it worked the first try. So I recommend giving it a try with a different device I guess.
That’s so weird. So updating a NodeMCU for me is not working. So I tried a ESP8266 D1 mini and it worked So i am fully the other way around. 1 thing, I need the Nodemcu though due to it’s Bluetooth
I had this to. Did the “Prepare for first use” and got this after. Was able to close Chrome, re-open the dashboard and “Configure Wifi”. It would let me prepare for first use again, but with the same error.
Wd love if error messages were somewhat useful for newbs.
I recently came accros the same issue. For me it was related with using the ESPhome web for flashing the units together with a Wemos D1 Mini Pro.
For some reason the wizard doesnt show the Device selection panel in ESPhome web (at least for me). Therefore it created a wrong configuration. Flashed it to the ESP8266 but was afterwards unable to connect giving the “Port error” message.
I solved it by creating the configuration in HA. Downloading it. And than installing it in ESPhome web. Afterwards everything worked just fine.
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I had the same issue for the last few days. I was able to get it to work by using the github page (ESP Web Tools) as opposed to the esphome page (https://web.esphome.io/).
if u use a esp that allready has software on it, you’ll need to flash it first.
ive used de standard flasher from nodemcu. (GitHub - nodemcu/nodemcu-flasher: A firmware Flash tool for nodemcu)
I have mine flashed already from years ago. That’s why I was having issues.
Switching to the GitHub.io version like someone else suggested did work for me. That’s worked for other devices in the past as well.
Surprisingly, I didn’t need to hold the “Flash” button when plugging it in either!
In the future, I’m curious if this .io address is still valid with all the controversy going on. Not related to ESPHome though but might make it hard to flash in the future.