Error message when uploading data sources

When data sources are uploaded, there may be error messages shown. Below are some examples of these, and information about how to fix them.

There is a column with no name:

If this message appears but you believe all columns have names, then please note there can be some hidden data outside the data area. Delete some of the "empty" columns, then save and re-upload the data source. 

There is a row with no ID

Similarly, if you believe all rows have IDs, there can be some hidden data outside the data area. Delete some of the "empty" rows, save and re-upload, and the problem should be fixed.