indexes cannot be recreated

One more issue with 1.2.1.
After deleting the .indexer dirs and running the repo-scans, I see the following errors in the log:

2009-06-04 11:38:02,278 [http-8080-9] WARN  org.apache.archiva.indexer.search.NexusRepositorySearch  - IO error occured while accessing index of repository 'internal' : /opt/managed_repos/internal/.indexer/_3.cfs (No such file
 or directory)
2009-06-04 11:38:02,289 [http-8080-9] WARN  org.apache.archiva.indexer.search.NexusRepositorySearch  - IO error occured while accessing index of repository 'snapshots' : /opt/managed_repos/snapshots/.indexer/_14_6.del (No such
 file or directory)
2009-06-04 11:44:17,922 [http-8080-6] WARN  org.apache.archiva.indexer.search.NexusRepositorySearch  - IO error occured while accessing index of repository 'internal' : /opt/managed_repos/internal/.indexer/_3.cfs (No such file
 or directory)
2009-06-04 11:44:17,933 [http-8080-6] WARN  org.apache.archiva.indexer.search.NexusRepositorySearch  - IO error occured while accessing index of repository 'snapshots' : /opt/managed_repos/snapshots/.indexer/_14_6.del (No such
 file or directory)
2009-06-04 11:44:31,728 [http-8080-4] WARN  org.apache.archiva.indexer.search.NexusRepositorySearch  - IO error occured while accessing index of repository 'internal' : /opt/managed_repos/internal/.indexer/_3.cfs (No such file
 or directory)
2009-06-04 11:44:31,772 [http-8080-4] WARN  org.apache.archiva.indexer.search.NexusRepositorySearch  - IO error occured while accessing index of repository 'snapshots' : /opt/managed_repos/snapshots/.indexer/_14_6.del (No such
 file or directory)

What's going on ?
Why are the files not being created automatically?