It is not possible to set an effect name that is longer than 39 bytes via scripting

[RonnyL]

It is not possible to set an effect name that is longer than 39 bytes via scripting.

But, in some languages (e.g. german) the default effect names of the built-in animation presets using expressions are way longer than 39 characters. And therefore it's not possible to use scripts doing something with those long effect names.

 

[Airweb_AE]

You can use the effect index instead of its name using a function like this:

function getEffectIndex(layer, effectName) {
  for (var i = 1; i <= layer.effect.numProperties; i++) {
    if (layer.effect(i).name == effectName) {
      return i
    }
  }
  return null
}

// usage
var proj = app.project;
var thisComp = proj.activeItem;
var layer = thisComp.layer(1);

layer.effect(getEffectIndex(layer, 'longEffectName'))(1).setValue(100)

[lloydalvarez]

The bug is that the effect name cannot be set via scripting if the name is more than 39 bytes. Adobe bug ID: DVAAE-4229694

[nishu_kush]

A ticket has been filed for further investigation. Thanks for reporting it.

Best,

Nishu