Form plugin for WordPress on a seriously out of date install won't update until I update WordPress core. Fine, I update core and update the plugin and test the forms again. Form still isn't sending emails on submission. Look into forms settings. Oh look error messages, awesome!

Message: "There are 2 configuration errors"

OK, what are the errors where are the errors?

"There are two configuration errors."

Gee that's really fucking helpful, why even tell me you can see the errors if you aren't going to fucking tell me where the blasted things are. Spend 4 fucking hours trying to figure this out, checking "docs" wiki, support forums, nothing.

Finally decided to just trash the client's form plugin they were using and installed my reliable Gravity Forms.

P.S. if you are going to write code to find errors, and tell me about them, then you had better fucking tell me what the goddamned error is. There is no need to waste a developer's time trying to debug your shitty plugin because you couldn't be bothered to write a useful error handler.