Hi Atoji, and welcome on this board.
Sorry you're encountering this issue.
I tried to reproduce it , by opening and old live set containing clip made with a previous version of analog lab 2, after updating Analog lab 2 to current version 2.1.1.25.
unfortunately, i had no issue.
So in order for us to investigate deeper, could you please tell us :
What is your OS?
What is your current version of Live? What was the version of Live when you first created this live set?
Is it a full or lite license or Live?
and finally (maybe difficult to answer) what was the version of analog LAB 2 when you first created this live set?
*EDIT* did you try a rescan of your plugins , using Live preferences panel?
best,