fatal error after uploading plugin

Hello there,
I already e-mailed you but figured that this might be the faster way to reach you?

I have uploaded the plugin and now I cant get into the backend anymore… shows me this error:

Fatal error: Call to a member function set_archive_filename() on null in /home/btvsadmin/brandtuitives.com/wp-content/plugins/backupwordpress/functions/core.php on line 110

what do I do?

Thanks,
K

https://ww.wp.xz.cn/plugins/backupwordpress/