Re: Render error when attempting to render renamed psd file

First of all, Photoshop template expects the file name to be something like: rendered[#####].psd, so the rendering program can fill in the sequence index - even if you only render 1 frame. So if you change your last line to
renderItem.outputModules[1].file = new File(retPathObj.fullName + '/' + theComp.name + '_' + i.toString() + '-[#####].psd')
It should work, except it adds 00000 to every output frame.
By the way, you can greatly simplify your code by using the renderItem.skipFrames attribute - if you set renderItem.skipFrames = 1, every other frame will be rendered, if 2, every 3rd frame is rendered. So discarding your loop, you'll have something like:
var renderItem = app.project.renderQueue.items.add(theComp);
renderItem.timeSpanStart = 0;
renderItem.timeSpanDuration = theComp.duration;
renderItem.skipFrames = 5; // render every 6th frame
renderItem.outputModules[1].applyTemplate("Photoshop");
renderItem.outputModules[1].file = new File(retPathObj.fullName + '/' + theComp.name + '-[#####].psd')

This way, you only have 1 render item which outputs all sampled frames for you.

Xinlai Ni
Software Engineer, Google Inc.