Actually I may have solved this.I re created the file and uploaded this again and it seems to have worked....I started from scratch basically.I am still unclear as to what the issue was but if I encounter this again I will follow the same course of action.Many thanks again for your help! (This was m...

Many thanks to both of you for your responses.I have tried deleting any empty columns above and below the data but when I tried uploading the file again I got the same result.Attached is a screenshot of the top of the file. The variable is v74 and the the values in the key column are correct. 

Hi, I hope someone can help me,I am attempting to import a classification file and every time I try I get the following error message:"First column is required to be the key"The first column in my file is indeed the key so I don't understand what the issue is. I recall having this problem before and...