Hi @anna.popovychenko, I wonder if the root cause of this is the same as the other thread.
Assuming that you currently have the following code:
real_data = pd.read_csv("file.csv")
real_data= real_data.convert_dtypes()
I would recommend removing the second line (convert_dtypes command). And perhaps loading multiple CSVs at once for convenience.
from sdv.datasets.local import load_csvs
# load multiple CSV files from within a folder
real_data = load_csvs(folder_name='my_folder/')
# the data is ready for training
# no modifications should be needed