failed to find target with hash string 'android-26' in: C:\ProgramData\Microsoft\AndroidSDK\25

You are getting the below issue, which is build error from android cordova application

* What went wrong:

> failed to find target with hash string 'android-26' in: C:\ProgramData\Microsoft\AndroidSDK\25

It is happening as you have not installed the particular image which your application is pointing to. You are missing the image where your android SDK is present as 

C:\ProgramData\Microsoft\AndroidSDK\25

You are having the android SDK version mentioned in Build.Gradle as like below.

ext {     apply from: 'cordova.gradle'     cdvCompileSdkVersion = 26 //privateHelpers.getProjectTarget()     cdvBuildToolsVersion = privateHelpers.findLatestInstalledBuildTools() }

You need to install Image from  android SDK manager. You will get it from below path. 

C:\ProgramData\Microsoft\AndroidSDK\25\tools  clink on android.bat file then it will open and install the below content for image 26.

For me it is installed that’s why it is looking as installed. Based on requirement install the image.