I'm hosting an application with AWS, using elasticbeanstalk. I'm using the toolbelt to push my application from my local machine. Up until a couple weeks ago, everything was working fine, but recently my changes aren't taking effect. I can see in the aws management console that my application is being pushed and deployed, but changes aren't coming through. 

I checked the environment event log to see if anything was new from a typical deployment and the error I'm seeing is 

```
ERROR   Update environment operation is complete, but with command timeouts. Try increasing the timeout period. For more information, see troubleshooting documentation.
ERROR   During an aborted deployment, some instances may have deployed the new application version. To ensure all instances are running the same version, re-deploy the appropriate application version.
ERROR   Failed to deploy application.
ERROR   Unsuccessful command execution on instance id(s) 'i-8d88a587'. Aborting the operation.

```

What is the problem exactly, and what can I do to fix this?