Error while viewing table


While trying to view a table in Toad Data Point v 3.6 the following error is displayed:

Can anyone please advise why this is.



What are the datatypes of the columns? Can you post a screenshot of the column datatypes? Does this error occur only on this table?

They are either varchar or integer and it happens on any table. I can view 2 tables and 3rd one results in this error.