[Plugin: Special Recent Posts] SRP error

I get the following error when using Special Recent Posts

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in C:\xampp\htdocs\wordpress\wp-content\plugins\special-recent-posts\classes\class-main.php on line 53

I have installed WordPress on a local server in XAMPP; gd support is enabled.

Any thoughts as to why this error is occurring?

https://www.ads-software.com/extend/plugins/special-recent-posts/