Plugin "null" could not be loaded, do you want to remove it from xfce4-panel configuration?

I have nethunter android tablet. I set up the local Kex server, when i start the KEX client I get this error:

Plugin "null" could not be loaded, do you want to remove it from xfce4-panel configuration?

this plugin is in the current xfce4-panel configuration but could notbe loaded, probably due to an installation issue.

I run those commands

sudo apt install --reinstall xfce4-panelsudo apt install xfce4-goodies

but the error still persists. Whereever I click on the screen opens the start menu