Jasper: Cannot print anymore a report after operpserver restarts

[J. Mainka]

If the openerp service must be restarted it is not possible to print a jasper report.

Following error occurs:

Traceback (most recent call last):
  File "/opt/openerp-server-5.0.7/bin/service/web_services.py", line 682, in go
    (result, format) = obj.create(cr, uid, ids, datas, context)
  File "/opt/openerp-server-5.0.7/bin/report/report_sxw.py", line 364, in create
    fnct_ret = fnct(cr, uid, ids, data, report_xml, context)
  File "/opt/openerp-server-5.0.7/bin/report/report_sxw.py", line 426, in create_source_pdf
    return self.create_single_pdf(cr, uid, ids, data, report_xml, context)
  File "/opt/openerp-server-5.0.7/bin/report/report_sxw.py", line 447, in create_single_pdf
    pdf = create_doc(etree.tostring(processed_rml),rml_parser.localcontext,logo,title.encode('utf8'))
  File "/opt/openerp-server-5.0.7/bin/report/interface.py", line 183, in create_pdf
    obj.render()
  File "/opt/openerp-server-5.0.7/bin/report/render/render.py", line 50, in render
    result = self._render()
  File "/opt/openerp-server-5.0.7/bin/report/render/rml.py", line 41, in _render
    return rml2pdf.parseNode(self.rml, self.localcontext, images=self.bin_datas, path=self.path,title=self.title)
  File "/opt/openerp-server-5.0.7/bin/report/render/rml2pdf/trml2pdf.py", line 781, in parseNode
    r.render(fp)
  File "/opt/openerp-server-5.0.7/bin/report/render/rml2pdf/trml2pdf.py", line 198, in render
    pd = self.etree.find('pageDrawing')[0]
TypeError: 'NoneType' object is unsubscriptable

If I making an upload of the report and saving it, then it works.

It seems that the reports are not registered after restarting the openerp service. I'm not a python-programmer, so I don't know where to try out a registration of the (custom) reports after a restart.

Regards
J. Mainka