Pharo state corrupt, how to save my code?

After using DynamicComposableModel and editing my method in debugger, my Pharo 6.1 image has reached this state:

Instance of SpecLayout did not understand #visibleSlots

and

Instance of SpecLayout did not understand #instVarNames

. I cannot "File Out" my code because of these errors. I cannot even browse my class, which is actually called "UIVidya" and should be defined by

ComposableModel subclass: #UIVidya
    instanceVariableNames: 'vidya listE editE tabmgr'
    classVariableNames: ''
    poolDictionaries: ''
    category: 'vkVidya'!

. In the broken image, UIVidya classLayout returns SpecLayout. In a healthy image, UIVidya classLayout returns FixedLayout. I did not make this change on purpose and do not even know how it happened. Can I heal my broken Pharo image in-place, without abandoning the last changes?

Solution

I was able to restore normalcy by doing this in Playground:

UIVidya layout: sdfgh

(which is the same as UIVidya layout: nil). Thanks for your attention, what really helped was aggressive use of the System Browser and Playground to compare broken and non-broken Pharo instances. Now I can "File Out" my code!

EDIT:

The problem came from outdated tutorial at https://benjamin.vanryseghem.com/projects/spec/docs/dynamic/ which includes code that sends layout:. Don't do that in modern Pharo!