Import error simply says “error”

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I’m trying to import a rather large CSV file. All attempts fail after about 2 minutes of importing. I get a pop-up that says the import failed and click “ok” to see the error. Then the error simply says “error.”

Thinking it was probably because my CSV file was too big, I downsized another copy with only 200 posts. The posts only have about 5 fields, nothing crazy large. This one failed as well.

Testing 3 times, they all import around 50 custom posts, but they aren’t failing at a consistent place each time.