Problems with ProcessImageTag.java

[jainer]

Hi

When i try to start the second task of my process, shows the next exception:

17:58:36,095 ERROR [Engine] ApplicationDispatcher[/jbpm] Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
 at org.jbpm.webapp.tag.ProcessImageTag.extractBoxConstraint(ProcessImageTag.java:172)
 at org.jbpm.webapp.tag.ProcessImageTag.writeTable(ProcessImageTag.java:145)
 at org.jbpm.webapp.tag.ProcessImageTag.doEndTag(ProcessImageTag.java:74)
 at org.apache.jsp.task_jsp._jspx_meth_jbpm_processimage_0(task_jsp.java:2839)
 at org.apache.jsp.task_jsp._jspx_meth_f_view_0(task_jsp.java:197)
 at org.apache.jsp.task_jsp._jspService(task_jsp.java:138)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
 at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:704)
 at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:474)
 at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:409)
 at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
 at org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:415)
 at org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:234)
 at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:300)
 at javax.faces.webapp.FacesServlet.service(FacesServlet.java:95)
......

This is just a part of the exception, but i beleive that is the most important. Any suggestions???

Regards!!

jainer e.