Strange Line across Worksheet

[Amature Amy!]

A black vertical line has appeared in one of my worksheets and I can't seem
to get rid of it.
I thought I might have freezed my info, but I check in the window button and
I haven't.
What could it be, and how do I delete it.
Thank you.

 

[Don Guillett]

zero line on a row perhaps?
select cells button in the upper left>click between any two row numbers.