Build service could not create build operation: unknown error while handling message: Msg Handling Error(message: “unable to initiate PIF transfer session (operation in progress?)”)

If you’re developing an iOS app using Xcode, you might encounter a frustrating error message like this:

Build service could not create build operation: unknown error while handling message: MsgHandlingError(message: "unable to initiate PIF transfer session (operation in progress?)")

This error can be perplexing, especially when you’re in the middle of development and need a smooth build process. In this blog post, we’ll explore the potential causes of this error and provide step-by-step solutions to help you resolve it and get back to building your app.


What Does the Error Mean?

The error message indicates that Xcode’s build system is having trouble creating a build operation due to an issue with initiating a PIF (Property Information Format) transfer session. This can happen for various reasons, including:

  • Corrupted Xcode derived data
  • Conflicts within Xcode’s internal build services
  • Issues with Xcode settings or project configurations

How to Fix the Error

Let’s walk through several potential solutions to resolve this error.

1. Clean the Build Folder

One of the simplest solutions is to clean your build folder, which can remove any corrupted build artifacts.

Steps:

  1. Open your project in Xcode.
  2. Go to the Product menu in the top bar.
  3. Hold down the Option key and select Clean Build Folder (or press Shift + Command + Option + K).
Figure: Cleaning Build Folder

After cleaning the build folder, try building your project again.

2. Restart Xcode and Your Computer

Sometimes, Xcode or your macOS system may be in an unstable state. Restarting both can help reset any stuck processes.

Steps:

  1. Close Xcode completely.
  2. Restart your computer.
  3. Open Xcode again and try building your project.

3. Delete Derived Data

Xcode stores intermediate build information in a folder called “Derived Data.” Sometimes, this data can become corrupted and cause build issues.

Steps:

  1. Open Xcode.
  2. Go to Xcode > Preferences > Locations.
  3. Click the arrow next to the Derived Data path to open it in Finder.
  4. Delete all the contents of the Derived Data folder.

After deleting derived data, try rebuilding your project.

4. Clear Cache

Sometimes, background processes related to Xcode or the build system can cause conflicts. Therefor clearing the cache files can also helps to fix.

Steps:

  1. Click on Go.
  2. Press option key on your keyboard, a Library option will appear, click on it.
  3. Click on Caches, select all and move to Trash.
Figure: Library Option
Figure: Cache folder
Figure: Removing Cache Data

Once you clear caches contents, Close the Xcode, again open it and run the project.

The “Build service could not create build operation” error in Xcode can be frustrating, but it’s often resolvable with the steps outlined above. By cleaning your build folder, resetting the build system, or checking for background processes, you can usually get back to coding in no time.

You can also follow the video tutorial.

I hope this guide helps you solve the error and get back to building great iOS apps!

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