Any WP pros able to offer some help?

I have been looking for a Wordpress Invoicing and Quoting solution. WP Invoice doesn't quite do it as a Freshbooks replacement, so I thought I'd try Cashpress as it has the ability to handle proposals.

Anyway, it crashes when installed and I have posted in the plug-in support forum, but while I'm waiting for a response, I thought I'd see if any of you lovely chaps here would know of a fix for this bug.

The error is logged here: