Extendscript Undo Groups (app.beginUndoGroup) always throws error

Question

I'm working on a script and I just finished creating a function that renders certain items and then import them into after effects.

I want to add

app.beginUndoGroup('Render and import');

before the function and

app.endUndoGroup();

after the function, so I can undo all the actions within that function that affects the project.

Everything together looks like this

button1.onClick = function () {

app.beginUndoGroup('Render and import');

getUnsupportedLayers();

app.endUndoGroup();

// app.executeCommand(app.findMenuCommandId('Undo')); // Edit Menu > Undo

// app.executeCommand(16); // Edit Menu > Undo

}

Here's a screenshot of all the actions performed in that function which can be found under Edit > History

This is basically the history for 1 imported item, since the final script will do this for multiple files I need an effective way to undo all actions for all items.

The errror I get with the from after effects when pressing CTRL+Z is:

"Undo group mismatch, will attempt to fix."

Otherwise everything works completely fine without the Undo groups involved.

My goal with this is to create a scriptui button that will undo all of those actions.

If any of you know a way to make this work or perhaps having the same issue then please let me know.

manjunath MK · Accepted Answer

When you render ur undo history is cleared for some reason and you can't undo something which happend before render.

You may need to write script that can work like below.

Before render some actions are performed and then, trigger render from script > check if rendering is complete >after render is done > perform reveresed actions.

/// Plz refer that ae scripting guide for syntax

renderAndImport_button.onClick=function(){

myActions();

app.renderQueue.render();

if(app.renderQueue.stillRendering){

sleep(1 min)

}else{

myActionReversed();

}

// Plz refer that ae scripting guide for exact method and names

//See if this helps.

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