Ionic File Encryption

I’m trying to use Ionic Native File Encryption plugin which works with Cordova Safe plugin.

However, after I add the plugin and try to run (even without using it in my code) it using ionic cordova run android, I get this error:

at ChildProcess.whenDone (C:\Users\User\Ionic\App\platforms\android\cordova\node_modules\cordova-common\src\superspawn.js:169:23)
at emitTwo (events.js:126:13)
at ChildProcess.emit (events.js:214:7)
at maybeClose (internal/child_process.js:925:16)
at Process.ChildProcess._handle.onexit (internal/child_process.js:209:5)
(node:70968) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)

What is the problem?