Why Does Batch Replacement Interrupt, Pop Up, or Throw Errors?
There are two easily overlooked "hidden behaviors" in Photoshop that usually cause batch scripts to interrupt or fail:
The Main Template File is Unsaved (Triggers system errors)
If your active PSD template is newly created and has not been saved to your disk (displayed as "Untitled-1"), or if it has unsaved changes (indicated by an asterisk * next to the filename), running the script will frequently trigger errors such as "Selection is not available" or "Command cannot be executed." This happens because Photoshop cannot allocate a stable temporary scratch path for unsaved documents.
The Smart Object is Flagged as "JPG Format" (Triggers save dialog popups)
If you drag a JPG image directly into Photoshop, or convert a flat JPG background layer into a Smart Object, Photoshop flags this Smart Object internally as "JPG format." The JPG format does not support transparency or multiple layers. When the script automatically places a new image inside, Photoshop detects the layer/format conflict and prompts a "Save As" dialog, halting the automated process.
To ensure the batch script runs smoothly without interruption, please follow these template preparation guidelines:
💾 Step 1: Pre-Run Preparation (Crucial Error Prevention)
Save Your File First: Before running the script, press Ctrl + S (Cmd + S on Mac) to save your active template as a formal PSD/PSB file on your disk.
Ensure there is no asterisk * next to the file name. Once the file is written to the disk, Photoshop can allocate the necessary temporary cache, preventing path-related system errors.
✅ Step 2: Best Practice — Creating a Compatible Smart Object from Scratch
Instead of dragging an image directly from your computer into the main canvas, use this method:
Select the Rectangle Tool (Shortcut: U) from the left toolbar and draw a solid color rectangle roughly matching your target size.
Right-click the rectangle layer in the Layers panel and select Convert to Smart Object.
This creates a versatile, PSB-backed Smart Object container that supports transparency and multiple layers without format conflicts.
Double-click this new Smart Object thumbnail to open it, place your mockup artwork inside, save, and close.
🩺 Diagnosis & Recovery: Checking Existing Templates
If you are working with templates created by others, you can inspect them to see if they will cause errors:
Inspection Method: Double-click the Smart Object thumbnail in your template to open its contents.
Check the Layers Panel:
❌ Dangerous: There is only one layer named Background with a lock icon 🔒. This type of Smart Object will likely trigger a popup dialog and interrupt the batch process.
✔️ Safe: The layers are named Layer 0, Rectangle 1, or organized in a folder without any locked background layers.
How to Recover a Locked Smart Object:
Close the Smart Object document. In the main template, delete the problematic Smart Object layer. Follow Step 2 to draw a new vector rectangle in its place, convert it to a Smart Object, and position it accordingly.
When your main template is saved to disk and your Smart Objects do not contain locked background layers, the batch process can run continuously without manual intervention.