I have Aerogear set up properly for iOS notifications and they are working, however Android is not. Registration works no problem, but sending pushes does not. I have 4 devices registered and I am getting the following error when sending a test notification to the devices. Error sending payload to GCM server: java.util.ConcurrentModificationException https://gist.github.com/anonymous/89d575bc8892f68bc0f5 <https://gist.github.com/anonymous/89d575bc8892f68bc0f5> Any help would be greatly appreciated! -- View this message in context: http://aerogear-dev.1069024.n5.nabble.com/Android-GCM-PUSH-ERROR-Error-se... Sent from the aerogear-dev mailing list archive at Nabble.com. _______________________________________________ aerogear-dev mailing list aerogear-dev(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/aerogear-dev