Problem with inserting WP-Statistics in sidebar

Hello there, I did the following steps:

1- Upload wp-statistics to the /wp-content/plugins/ directory.
2- Activate the plugin through the ‘Plugins’ menu in WordPress.

But while I try to add this extension in the sidebar of my theme, at first I get this error:

An error has occurred. Please reload the page and try again.

In farsi:
????? ?? ???. ???? ???? ?? ?????? ???????? ???? ? ??? ?????? ??? ????.

How can I fix this issue?

Thanks in advance

https://www.ads-software.com/plugins/wp-statistics/