Looks like my guess of the internal classcausing the problem may be correct. I found this bug report, though I cannot find the report for the new one referenced at the bottom, nor can I find any notes of resolution to it. I assume it's an internal bug number.
http://bugs.adobe.com/jira/browse/ASC-3588Update:
Externalizing the two internal classes did the trick. Everything now compiles properly. I just moved the two internal classes into the core directory as GroupStore.as and InterceptorMapping.as. I hope they fix this bug, losing the ability to use internal classes sucks.