I tried to make a new report with OpenERP Report Designer, so i opened up Openoffice made a new document, clicked on "open a new report" clicked "invoices" and saved it als a new invoice. But now if i want to use it (the option to print the document appears at the print dropdown menu at invoices) i get the following error:

report.account.invoice.rndwdGwZ

(<type 'exceptions.keyerror'="">, KeyError(u'report.account.invoice.rndwdGwZ',), <traceback object="" at="" 0x54e2cf8="">)

whats wrong?