CrossOnlineCount / Combined Slot dynamic field error

I tried to edit this plugin https://github.com/TheFixerDevelopment/CrossOnlineCount that query online player in Slapper nametag but I got stucked in this error.
Error: Cannot access dynamic field "server": Dynamic field access on pocketmine\nbt\tag\CompoundTag is no longer supported
File: vendor/pocketmine/nbt/src/tag/NoDynamicFieldsTrait
Line: 31
Type: RuntimeException

 

Hi, Send the part of the code

 

Try this: https://github.com/ethaniccc/CrossOnlineCount

 

Thanks, didn't know that one exist