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No parameterless constructor defined for this object error when upgrading from 8.2 to 9.2

After upgrading from 8.2 to 9.2 we're running into a "No parameterless constructor defined for this object error" (screenshot w/ stack trace below). Some additional info... site is still using webforms and Lucene, xDB is disabled, and all DLLs seem to be correct based on the assembly list that was downloaded.

Does anyone have any ideas/suggestions for this?

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