AIF - Trying to deploy a service

Hi,

I'm trying to deploy a service in the AIF but I get the following errors:

'Cannot create a record in SysXppAssembly (SysXppAssembly). The record already exists.'

'Service generation may fail because the incremental build has failed.'

My service then seems to deploy fine but I don't think it has worked as any changes I make to the schena aren't there, it seems to be stuck at a previous deployment.