Resolved After installing new RO CSV on Joomla 5.3.1

Hi,
after a longer time now ned to use your tool again, bought new subscription.
If I want to opoen a example template I get this error:
An error has occurred.
0 htmlspecialchars(): Argument #1 ($string) must be of type string, array given
Any idea?
source server = PHP 8.2.28
import to server = PHP 8.4.7
If I want to install example templates on the source server = nothing to see after installing

Can you check where is my error?
Thanks

Details see in Site details
thank you!