Pharo 12 - exception with Spotter after loading TaskIt

[LANDAISB]

Hello,

I have an exception when I try to open Spotter tool (Shift+Enter) on Pharo12: WeakRegistry undeclared

1. I use a fresh Pharo12 image, open Spotter tool OK.
2. I load taskIt v1.2.0 (but same with master)
   [ Metacello new baseline: 'TaskIt'; repository: 'github://pharo-contributions/taskit:v1.2.0'; load. ] on: MCMergeOrLoadWarning do: [ :warning | warning load ]
3. Trying to open Spotter tool again, i got an exception:
   

[SabineMa]

I can confirm. I just wanted to test loading our application with P12 and

Metacello new
  baseline: 'TaskIt';
  repository: 'github://pharo-contributions/taskit';
  load.

Is not possible to load Taskit with a p12 image from launcher.
I am having exactly the same walkback.

[JanBliznicenko]

Same problem in Pharo 13 and 14