cubicweb-semnews #3020618 ERROR : concurrent synchronization detected, skip pull [open]

I get error server side

2013-07-16 15:20:23 - (cubicweb.sources.Sénat - Derniers rapports) ERROR: concurrent synchronization detected, skip   pull
2013-07-16 15:20:23 - (cubicweb.sources.Gouvernement - Accueil) ERROR: concurrent synchronization detected, skip pull
2013-07-16 15:20:23 - (cubicweb.sources.Reuters - Top News) ERROR: concurrent synchronization detected, skip pull

Are these really errors or just warnings ?

prioritynormal
typebug
done in<not specified>
closed by<not specified>