CordovaError: Failed to fetch platform cordova-android@~7.0.0

Estou tendo problema para adicionar a plataforma android ao meu projeto. Ao dar o comando ionic cordova platform add android, tenho o seguinte retorno.

Using cordova-fetch for cordova-android@~7.0.0
(node:5084) UnhandledPromiseRejectionWarning: CordovaError: Failed to fetch platform cordova-android@~7.0.0
Probably this is either a connection problem, or platform spec is incorrect.
Check your connection and platform name/version/URL.
Error: cmd: Command failed with exit code 1 Error output:
'C:\WINDOWS\system32\npm' n�o � reconhecido como um comando interno
ou externo, um programa oper�vel ou um arquivo em lotes.
    at C:\Users\SS Solutions\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\src\cordova\platform\addHelper.js:312:25
    at _rejected (C:\Users\SS Solutions\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\node_modules\q\q.js:797:24)
    at C:\Users\SS Solutions\AppData\Roaming\npm\node_modules\cordova\node_modules\cordova-lib\node_modules\q\q.js:823:30
    at Promise.when (C:\Users\SS Solutions\AppData\Roaming\npm\node_modules\cordova\node_modules\q\q.js:1142:31)
    at Promise.promise.promiseDispatch (C:\Users\SS Solutions\AppData\Roaming\npm\node_modules\cordova\node_modules\q\q.js:808:41)
    at C:\Users\SS Solutions\AppData\Roaming\npm\node_modules\cordova\node_modules\q\q.js:624:44
    at runSingle (C:\Users\SS Solutions\AppData\Roaming\npm\node_modules\cordova\node_modules\q\q.js:137:13)
    at flush (C:\Users\SS Solutions\AppData\Roaming\npm\node_modules\cordova\node_modules\q\q.js:125:13)
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)
(node:5084) 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:5084) [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.