[MJSONWP] Encountered internal error running command: TypeError: Invalid Version: android-4.4

Appium logs

[Appium] Welcome to Appium v1.7.2
[Appium] Appium REST http interface listener started on 0.0.0.0:4723
[HTTP] --> POST /wd/hub/session {“desiredCapabilities”:{“appActivity”:“com.dcg.delta.activity.OnboardingActivity”,“appPackage”:“com.fxnetworks.fxnow.uat”,“autoAcceptAlerts”:true,“autoDismissAlerts”:true,“browserName”:"",“deviceName”:“Samsung S6”,“fullReset”:false,“noReset”:true,“platformName”:“Android”,“platformVersion”:“7.0”},“capabilities”:{“desiredCapabilities”:{“appActivity”:“com.dcg.delta.activity.OnboardingActivity”,“appPackage”:“com.fxnetworks.fxnow.uat”,“autoAcceptAlerts”:true,“autoDismissAlerts”:true,“browserName”:"",“deviceName”:“Samsung S6”,“fullReset”:false,“noReset”:true,“platformName”:“Android”,“platformVersion”:“7.0”},“firstMatch”:[{“browserName”:"",“platformName”:“android”}]}}
[MJSONWP] Calling AppiumDriver.createSession() with args: [{“appActivity”:“com.dcg.delta.activity.OnboardingActivity”,“appPackage”:“com.fxnetworks.fxnow.uat”,“autoAcceptAlerts”:true,“autoDismissAlerts”:true,“browserName”:"",“deviceName”:“Samsung S6”,“fullReset”:false,“noReset”:true,“platformName”:“Android”,“platformVersion”:“7.0”},null,{“desiredCapabilities”:{“appActivity”:“com.dcg.delta.activity.OnboardingActivity”,“appPackage”:“com.fxnetworks.fxnow.uat”,“autoAcceptAlerts”:true,“autoDismissAlerts”:true,“browserName”:"",“deviceName”:“Samsung S6”,“fullReset”:false,“noReset”:true,“platformName”:“Android”,“platformVersion”:“7.0”},“firstMatch”:[{“browserName”:"",“platformName”:“android”}]}]
[BaseDriver] Event ‘newSessionRequested’ logged at 1525778654331 (16:54:14 GMT+0530 (India Standard Time))
[Appium] Merged W3C capabilities {“desiredCapabilities”:{“appActivity”:"com.dcg… into desiredCapabilities object {“appActivity”:"com.dcg.delta.activity.Onboardi…
[Appium] Creating new AndroidDriver (v1.37.0) session
[Appium] Capabilities:
[Appium] appActivity: com.dcg.delta.activity.OnboardingActivity
[Appium] appPackage: com.fxnetworks.fxnow.uat
[Appium] autoAcceptAlerts: true
[Appium] autoDismissAlerts: true
[Appium] browserName:
[Appium] deviceName: Samsung S6
[Appium] fullReset: false
[Appium] noReset: true
[Appium] platformName: android
[Appium] platformVersion: 7.0
[BaseDriver] The following capabilities were provided, but are not recognized by appium: autoAcceptAlerts, autoDismissAlerts.
[BaseDriver] Session created with session id: 226337c2-6bd8-4f7d-97e7-c14f1cdc4612
[AndroidDriver] Getting Java version
[AndroidDriver] Java version is: 1.8.0_45
[ADB] Checking whether adb is present
[AndroidDriver] Shutting down Android driver
[AndroidDriver] Called deleteSession but bootstrap wasn’t active
[MJSONWP] Encountered internal error running command: TypeError: Invalid Version: android-4.4
at new SemVer (C:\Users\pb00465060\AppData\Local\appium-desktop\app-1.5.0\resources\app\node_modules\appium\node_modules\semver\semver.js:293:11)
at compare (C:\Users\pb00465060\AppData\Local\appium-desktop\app-1.5.0\resources\app\node_modules\appium\node_modules\semver\semver.js:566:10)
at rcompare (C:\Users\pb00465060\AppData\Local\appium-desktop\app-1.5.0\resources\app\node_modules\appium\node_modules\semver\semver.js:576:10)
at Array.sort (native)
at Array.sort (C:\Users\pb00465060\AppData\Local\appium-desktop\app-1.5.0\resources\app\webpack:~\core-js\modules\es6.array.sort.js:21:1)
at ADB.callee$0$0$ (C:\Users\pb00465060\AppData\Local\appium-desktop\app-1.5.0\resources\app\node_modules\appium\node_modules\appium-adb\lib\tools\system-calls.js:89:17)
at tryCatch (C:\Users\pb00465060\AppData\Local\appium-desktop\app-1.5.0\resources\app\node_modules\appium\node_modules\babel-runtime\regenerator\runtime.js:67:40)
at GeneratorFunctionPrototype.invoke [as _invoke] (C:\Users\pb00465060\AppData\Local\appium-desktop\app-1.5.0\resources\app\node_modules\appium\node_modules\babel-runtime\regenerator\runtime.js:315:22)
at GeneratorFunctionPrototype.prototype.(anonymous function) [as next] (C:\Users\pb00465060\AppData\Local\appium-desktop\app-1.5.0\resources\app\node_modules\appium\node_modules\babel-runtime\regenerator\runtime.js:100:21)
at GeneratorFunctionPrototype.invoke (C:\Users\pb00465060\AppData\Local\appium-desktop\app-1.5.0\resources\app\node_modules\appium\node_modules\babel-runtime\regenerator\runtime.js:136:37)
at
[HTTP] <-- POST /wd/hub/session 500 128 ms - 165

I think you are seeing this bug: Encountered internal error running command: TypeError: Invalid Version: android-6.0.1 · Issue #9926 · appium/appium · GitHub

The fix is in 1.8.0, so recommend you update.