When you try to import a CSV file, you might see an error message something like
C Stack usage 19383262 is too close to the limit. This could happen when separate in your data does not match the one set as the Separator parameter on the Import dialog. By default, the import dialog uses the comma (,) but your data might have something else (e.g. semicolumn) as the separator.
If this is the case, changing the Separator parameter value can fix the issue.