File Exchange Error 21916270 "Error - There is no active item matching the specified SKU|"

[stage3motorsports]

I'm trying to update inventory using file exchange, but I keep running into this error no matter what I try. 

Error Code 21916270 "Error - There is no active item matching the specified SKU|"

My questions are:

1. what does this mean? How does the file exchange link up to the correct SKU?

2. Is the correct action "revise" since these SKU's have already been added? 

[dollybeauty]

@stage3motorsports 

To change your quantity on hand, use the following format...

In my testing, using the SKU (CustomLabel) alone, does not work. Use the 'ItemID'.