Solved by mariosasko in post #2 
              
              
                Hi, 
If I understand you correctly, you are trying to create a dataset from two CSV files in one read, e.g.: 
dset = load_dataset("csv", data_files=["file1.csv", "file2.csv"])

which errors out because these files don’t share the same set of fields. 
If that’s the case, you have two options: 

creat…