Detaching a tab gives an error message that doesn't make sense

[Λύχνις Δαν]

Hi ya,

 

  Acc 12.0.1

  Win 10

 

  I created a brand new User Tool file and it of course showed up in a new tab in my current workspace.

  So I detached the tab and got a new workspace and immediately this dialog popped up :

 

 

Thx

D