failing open back pack

[robinspringer]

Help request

Problem upgraded to spigot 1.21 unfortunately we're getting a failure when trying to open it. please see the attcahed screenhot in game,

What I have tried we've tried mulitple time to uninstall and re-install. also clear player data and try again and it doesnt work!

[GeorgH93]

What's the output of /backpack version?

[robinspringer]

same result.... we've tried .4 nd .3 versions

thanks in advance

[GeorgH93]

Please share the output. So that i know exactly what your server config you are running.