A lot of files experience the same problem
You will need to select ‘Slot Width’ and make sure your ‘Old Material Thickness’ value matches (or is a close enough measurement with a +/- Tolerance value) the actual length of this segment:
Use the Measure Tool to check the size of this.
But first, your file might need a bit of a clean up - as I’m seeing what looks like open lines and and possible overlapping line segments? The tool doesn’t detect slot features if the shapes are not closed, clean and simple.
See if this files works better
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How thick is the assembly manual for that?
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