Cannot Select 'Input line or polygon vector layer' when trying to simplify Shapefile

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I'm trying to simplify a Shapefile by opening it in QGIS, Go to the Vector menu, selecting Geometry tools, and selecting Simplify Geometries...

When I do this I get a modal window that I can fill out completely except the very first menu titled 'Input line or polygon vector layer.'

Can anyone help me understand why this might be?



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