have you tried project => clean in eclipse?
also, when i was trying to convert a seam-gen proj to an eclipse ear i had both projects open and autobuilding, so the ant deploy from seamgen and hot deploy from eclipse were installing compopnents of the same name and giving this error (doh) maybe something to check
if all else fails, maybe try cleaning the relevant work/ and tmp/ entries as well as deploy/ stuff.
The same problem but with Seam 1.2.1GA . Tried Project..Clean in Eclipse, no effect. Restarted JBoss, Eclipse, emoved files manually - no way.
1) Shutdown your JBoss AS 4.0.5.GA
2) Delete the folder server/default/tmp/ . It contains deployment info and some times creates conflict with entities.
3) Go to your project folder and run:
5) Then do the deploy(wit hthe profile you need)
6) Then start the jboss AS.
This works for me when i have problems with diferent versions of the same Component.