dataset error

I keep on getting this error message whenever i try to refresh a dataset from the service.
Expression.Error: We cannot convert the value <ccon>"[Binary]" to type Binary.. </ccon>. The exception was raised by the IDbCommand interface. Table: Corvet.
When i check for the error on desktop i don't find any type of error, and if i run the refresh from desktop it goes just right with no problem, the table doesn't contain many rows wich makes it even easier to look for the error but nothing to be found.
The dataset used to work fine for months until it no longer wants to refresh from the PBI Service.
anyone who encountered this problem and found the way ??