Is it possible to share the workbook and also could you please share more details.
Thank you for answering.
Unfortunately i can't share the workbook.
Although, I can tell you that I have opened it this morning to modify some calculated field (adding "ZN()" to some of them) and it was working well until an error has occured. My calculated field got wrong and red.
Then, the workbook was closed and the error message I shared appeared when I tried to re-open it.
Maybe I should add that I am using a Custom SQL connection.