Unable to display reports after migration from 4.0 to 6.0

After migration from 4.0 to 6.0, I am no longer able to display the following reports :

  • Balance sheet
  • Income statement
  • Aged balance
  • Journals cash
    Everything else seems to be OK. May you assist ?
    Thank you
    Armand

What is happening? What are the error messages?

Thanks for your quick reaction. After reviewing the configuration of the chart of account. I noticed that the accounts were not linked to account-type anymore. I did a test by linking a few of them and I managed to display the reports. Therefore, I need now to review the whole chart of account.