Problem with PostgreSQL writeback adapter with CSV/Webform dataset

I've been having the oddest problem today. I've got a simple CSV file I've imported into Domo, and want to try to write that out to our PostgreSQL database. Connector has worked fine for other datasets, but when I created the writeback using this CSV dataset, I get the following:

 There was an error reading the downloaded CSV file from Domo

I then tried a webform dataset, and got the exact same issue. Has anyone ever run into this issue before? I really wish the error code would tell me what the exact error was.