Custom Column Error in Content Center

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I copied an existing family into my new read library. I added some rows to be able to generate a few variations that were not contained in the original family. I just copied exisitng row up several times and edited the information in those rows to yield desired new variations. I made sure the file name column contained a unique file name for these new members. When I go to publish I get this error message:
Defined file name does not include all custom columns. An identical file name can be generated for different members. Make sure that the file name is unique for any combination of custom column values to avoid placement failure
Missing Custom Columns:
Length
(see also attached screen shot)
I have scoured the file name column and can find no repeated file names; I cannot understand the rest of the error message. It must have something to do with the "does not include all custom values" portion of the error message. Can anyone decipher this for us?
Thanks
Mike