I bought your theme a while ago but I can not set it because I get an error.

Hello.
I am Japanese.
I am not very good at English, but I ask you a question.
Today, I purchased a theme called DW Jason from your site, but I can not reflect it.
I downloaded the zip file and installed the theme.
However, the following warning message will appear at the top of the page and the design will not be reflected.
Warning: count (): Parameter must be an array or an object that implements Countable in /home/hyugakoike/hyugakoike.com/public_html/wp-content/themes/dw-
(*1)
Even if you try to install the demo content, you will not see the display like the one shown.
(*2)
At the end of the phrase, the demo page can not be seen suddenly, it is the worst.
(*3)

I paid a lot of money, but I was full of deceived feelings.
Please tell me how to solve.