Error: pod: Command failed with exit code 31

[buu700]

cordova platform add ios fails with the error below. Is that something you've seen before and know of a workaround for?

I'm running OS X El Capitan with ruby 2.5.1p57, gem 2.7.6, and cocoapods 1.5.3.

Thanks!

---

Installing "cordova-plugin-firebase-messaging" for ios
Failed to install 'cordova-plugin-firebase-messaging': Error: pod: Command failed with exit code 31
    at ChildProcess.whenDone (/Users/buu700/cyph/cyph-phonegap-build/platforms/ios/cordova/node_modules/cordova-common/src/superspawn.js:169:23)
    at ChildProcess.emit (events.js:180:13)
    at maybeClose (internal/child_process.js:936:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:220:5)
(node:50695) UnhandledPromiseRejectionWarning: Error: pod: Command failed with exit code 31
    at ChildProcess.whenDone (/Users/buu700/cyph/cyph-phonegap-build/platforms/ios/cordova/node_modules/cordova-common/src/superspawn.js:169:23)
    at ChildProcess.emit (events.js:180:13)
    at maybeClose (internal/child_process.js:936:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:220:5)
(node:50695) 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:50695) [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.

[buu700]

Not sure what the problem was or what exactly fixed it, but I'm not seeing this error anymore after a brew update ; brew upgrade; pod repo update.

[burtontanner]

Not sure what the problem was or what exactly fixed it, but I'm not seeing this error anymore after a brew update ; brew upgrade; pod repo update.

Thanks for your answer @buu700. The only thing I had to add was to update cocoapods.
brew update; brew upgrade; sudo gem install cocoapods; pod repo update;

[jkasten2]

pod repo update alone fixed the Error: pod: Command failed with exit code 31 error I seen with another package. Updating cocoapods it self via brew update; brew upgrade; sudo gem install cocoapods; is probably not necessary.