UnhandledPromiseRejectionWarning when calling ionic cordova build --release android - ionic-framework

Question

I've been getting this error message whenever I try to use the
ionic cordova build --release android:
(node:1512) 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) (node:1512) [DEP0018]
DeprecationWarning: Unhandled promise rejections are deprecated. In
the future, promise rejections that are not handled will terminate the
Node.js process with a non-zero exit code.
Thanks for your answers !

Answer 1

This warning accures when you call a promise and doesnt add a catch block to it. The catch block gets called when the promise call gets rejected.
for example:
var foo = function () {
fooPromise
.then(function (res) {
// Do something with the response of the promise
})
.catch(function (err) {
// handle the error
});
};
Check the Javascript Documentation for more information: here