I have two 'derived column' tasks and one 'Union all' task to combine the results of two sources.
I was able to run the package without failure at very first time. After that i have changed the derived column expression to do some modifications to the package.
Note: just changed derived column expression to concat some hard coded string for more clarification.
After doing the above change, got the following error on 'Union All' task"The metadata for "combine 2 sets of rows.Inputs[Union All Input 3].Columns[ImportNotes]" does not match the metadata for the associated output column."