Cada vez que uso iónicoplatform add [platformname] Me da este error

Error: generar EACCES
en exportaciones._errnoException (util.js: 746: 11)
en ChildProcess.spawn (child_process.js: 1155: 11)
en Object.exports.spawn (child_process.js: 988: 9)
en Object.exports.spawn (/ usr / local / lib / node_modules / cordova / node_modules / cordova- lib / src / cordova / superspawn.js: 100: 31)
en runScriptViaChildProcessSpawn (/ usr / local / lib / node_modules / cordova / node_modules / cordova-
lib / src / hooks / HooksRunner.js: 188: 23)
en runScript (/ usr / local / lib / node_modules / cordova / node_modules / cordova- lib / src / hooks / HooksRunner.js: 131: 16)
en / usr / local / lib / node_modules / cordova / node_modules / cordova- lib / src / hooks / HooksRunner.js: 114: 20
en _fulfilled (/usr/local/lib/node_modules/cordova/node_modules/q/q.js:787:54)
en self.promiseDispatch.done (/usr/local/lib/node_modules/cordova/node_modules/q/q.js:816:30)
en Promise.promise.promiseDispatch (/usr/local/lib/node_modules/cordova/node_modules/q/q.js:749:13)