Error getting valid response from api. Check log file for error details

[jdavidbakr]

(This is not the same as https://github.com/AuthorizeNet/sdk-php/issues/308)

I've started getting this error completely randomly using the API. I don't see anything in my error log (I'm using Laravel and have logging going to the errorlog which is pretty much completely empty). I execute a large amount of transactions, so I know it's not a configuration error, but just randomly every couple of days I'm getting this error thrown, starting early in October.

I've made sure I'm up to date with the package - I'm on 1.9.9 and have been for 8 months. I'm assuming 1.9 is still supported - do I need to upgrade to 2.0?