How was the csv file exported? Is the first row the name of the columns?
If the cell was null is it omitted or an empty value entered?
Does the table you are imported it into match the data coming in?
The error says that a row has more or less columns then it is expecting. In the import wizard there is a screen to preview the csv data and another to map the columns from the file to the columns in the table. Do these columns match?
While it is available to create a new table from the csv, in the case I would suggest creating a new table before importing to have greater control on the column sizes.
Debbie