Error message while syncing

[hthompson1]

Several times I have gotten an error message while trying to sync new downloaded apps. I get "file not found cannot sync." This type of error. How do I know which file it is talking about?
The last time I got this after downloading a new app I shut down itunes while the phone was still connected and reopened itunes and the sync worked properly. The new app synced.
Anyone familiar with this type of problem?