Hi VY1, I think you have saved the data from Excel as a CSV file. Excel has changed some of the job numbers to dates, eg Apr-11, which results in the error. I suggest formatting that column as text, and possibly re-populating it, then save as a text file. Personally I prefer tab-delimited, in case the data has commas.
The amounts in your file have 9 decimal places; for a service invoice only 2 are needed/allowed.
Also be careful if the dollar values exceed $1000 as Excel may add quotes around the amounts; to prevent that, format the amounts as numeric, two decimal places, no commas.