Star rating Plugin Internal Server Error

I have installed the Star rating plugin but if a rating via ajax is submitted it returns:
URI: http://dev.grave/star-ratings.json/nonce:2ccaf062248735a2cccf04db4d6a74a8
message:“Page Not Found"

Can anoyone help with this error?

Thank you in advance.

Running in Apache on windows?

It is running locally on my Linux Mint PC using Apache

You posted on Github issues too, right? See my reply there

Yeah, that was me.