I want to deploy my Workflow-Project. I did it before and it functioned. But now I get following error.

SmartObjectServer Exception: Could not publish SmartObjectDefinition to Server:Exception of type'SystemOutOfMemoryException' was thrown.

 What can I do? Thank you for your reply.

I have had this error and have been able to resolve it by closing and reopening Visual Studio and/or restarting the blackpearl service on the blackpearl server.

 I have a blog post which has some additional tips on debugging failed deployments with cryptic error messages which you should check out if the above doesn't work for you.

 http://www.k2thought.com/?p=8

 Though the post doesn't focus on your particular error, the steps recommending (creating a deployment package/running the k2 service in console mode) are usually the best method for tracking down deployment issues.