I am trying to Set up a 'Turn Around Time', but I am getting '#InvalidColumnValue' or 'Unparseable'

I have a basic sheet that I am going to import an excel sheet into every morning. It is for sample release testing. I have a column for the date that the sample was logged in, and one for when the sample was approved for release.

I want to calculate the days it took from log in to approved. I have tried a few formulae that I found here, but I can't seem to get it to work. Here is what I have tried:

=([SLIM Approved]@row - PARENT([Log In Date]@row) ERROR: #INVALID COLUMN VALUE

=[SLIM Approved]@row - [Log In Date]@row) ERROR: #UNPARSEABLE

Here is a screenshot, sorry for the scribbles!

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