Error when Saving Changes on Theme Options

HI,

I keep getting an error message when I click “Save Changes” on the theme options – but it does save the update on the site – so it’s a bit confusing.

https://judgetest.stevenhargraves.co.uk/

“There was a problem with your action. Please try again or reload the page.”

Now, I’ve a mild suspicion that its due to me using a child theme – which I created using a plugin – as I’ve never had this error before and I’ve used Virtue loads of times in the past without an issue. I’m doing this site for a good friend as his current site is on a really out of date wordpress install – and has lots of errors cropping up – so I want this to work peachily!

I’m only using a child theme as it was advised elsewhere – and I wasn’t sure if this theme was updated in the future – it would overwrite any customisations I’ve made.

Thanks in advance for any pointers.

Ste