How to fix error "Could not detect Mac OS X Version from sw_vers output: '10.12 '" from Appium

It' worked for me.

You can config file by this command:

• grep -rl "Could not detect Mac OS X Version from sw_vers output:" /Applications/Appium.app/

• Terminal will show :/Applications/Appium.app//Contents/Resources/node_modules/appium/node_modules/appium-support/build/lib/system.js/Applications/Appium.app//Contents/Resources/node_modules/appium/node_modules/appium-support/lib/system.js/Applications/Appium.app//Contents/Resources/node_modules/appium-support/build/lib/system.js/Applications/Appium.app//Contents/Resources/node_modules/appium-support/lib/system.js

• Use command vim and config each file.

Example

vim /Applications/Appium.app//Contents/Resources/node_modules/appium/node_modules/appium-support/build/lib/system.js

Config file:

1. Change From ->

   case 10: _arr = ['10.8', '10.9', '10.10', '10.11']; _i = 0;

   To ->

   case 10: _arr = ['10.8', '10.9', '10.10', '10.11','10.12']; _i = 0;

vim /Applications/Appium.app//Contents/Resources/node_modules/appium/node_modules/appium-support/lib/system.js

Config file:

1. Change From ->

   try {stdout = (await exec('sw_vers', ['-productVersion'])).stdout;}

   To ->

   try {stdout = (await exec('sw_vers', ['-productVersion'])).stdout.trim();}

2. Change From ->

   for (let v of ['10.8', '10.9', '10.10', '10.11']) {if (stdout.indexOf(v) === 0) { return v; }}

   To ->

   for (let v of ['10.8', '10.9', '10.10', '10.11','10.12']) {if (stdout.indexOf(v) === 0) { return v; }}

vim /Applications/Appium.app//Contents/Resources/node_modules/appium-support/build/lib/system.js

Config file:

1. Change From ->

   case 10: _arr = ['10.8', '10.9', '10.10', '10.11']; _i = 0;

   To ->

   case 10: _arr = ['10.8', '10.9', '10.10', '10.11','10.12']; _i = 0;

vim /Applications/Appium.app//Contents/Resources/node_modules/appium-support/lib/system.js

Config file:

1. Change From ->

   try {stdout = (await exec('sw_vers', ['-productVersion'])).stdout;}

   To ->

   try {stdout = (await exec('sw_vers', ['-productVersion'])).stdout.trim();}

2. Change From ->

   for (let v of ['10.8', '10.9', '10.10', '10.11']) {if (stdout.indexOf(v) === 0) { return v; }}

   To ->

   for (let v of ['10.8', '10.9', '10.10', '10.11','10.12']) {if (stdout.indexOf(v) === 0) { return v; }}

Click start the stethoscope button

I went through the above steps even though I saw that it's been fixed by appium already.

Just run:

npm install appium-doctor -g

to update appium-doctor itself, then run:

appium-doctor

again to see it work.

Before and after fix: