I have little to no experience in using Datasets and Crystal Reports so please don't bash me if the answer is really obvious, I didn't manage to find the answer on-line.
I have a C# Winforms application, containing a Crystal Report that takes its data from a DataSet. I populate the DataSet dynamically from inside the application.
In the past, if I added another column to the DataSet, I could right click the DataSet in the Crystal Report and click "Verify Database" to make the new columns available in the Report.
Now, if I do this the following window pops up:

There is no item available in the Class Name combobox, and if I check the checkbox, another combobox appears which is also empty.
Please note that I populate the DataSet from inside the program, so there is no connection.
How can I update the DataSet in the Crystal Reports, so that the new columns become available?
Thank you.
P.S.: I have tried the following solution but it didn't work: Update DataSet Schema On Crystal Reports for VS2008 because I am presented with the same window as above.
Also, this is what I see, might be useful:

Edit1: The fields appear in the Data Sources but do not appear in the Field Explorer.
I already have some Formula Fields that have the same name as the newly added Columns but removing them didn't help either.