Hi, i'm trying to develop a mule server which has to interact with a jbpm process. The server seems to start and work, but if i try to view the process instance with the jbpm-console i get this exception

/main/process/view.xhtml @247,74 disabled="#{! processBean.hasProcessImage}": Error reading 'hasProcessImage' on type org.jbpm.webapp.bean.ProcessBean

The stack trace:
javax.el.ELException: /main/process/view.xhtml @247,74 disabled="#{! processBean.hasProcessImage}": Error reading 'hasProcessImage' on type org.jbpm.webapp.bean.ProcessBean
at com.sun.facelets.el.TagValueExpression.getValue(Ta gValueExpression.java:76)

I find out that i have the table jbpm_bytearray updated with new rows but with the filed name_ empty. Other processes deployed with eclipse have the rows filled up with the name of the corresponding file (e.g.processimage.jpg, processdefinition.xml). Could be this a problem?
Other rows, like the processinstance or the processdefinition, are filled up correctly, because i can see the process in the list of processes and the processinstance.
Any idea of where could be the problem? In the jbpm configuration?