Software⏱️ 3 min read📅 2026-06-03

How to Fix: Undefined symbols for architecture i386: _OBJC_CLASS_$_SKPSMTPMessage", referenced from: error

Error fix: Add SKPSMTPMessage framework to project settings.

Quick Answer: Add SKPSMTPMessage.framework to your project's 'Link Binary With Libraries' section.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🔧 Proven Troubleshooting Steps
  3. 💡 Conclusion

The error 'Undefined symbols for architecture i386: _OBJC_CLASS_$_SKPSMTPMessage', referenced from: objc-class-ref in ConfirmController.o' is encountered when trying to send an email using the SKPSMTPMessage framework in a background application on iOS devices with an i386 architecture. This issue affects developers who have imported this framework into their applications and are experiencing compilation errors.

This error can be frustrating as it prevents the application from compiling, leading to delays in development and deployment. Fortunately, this issue can be resolved by identifying and fixing the root cause of the problem.

⚠️ Common Causes

  • The primary reason for this error is that the SKPSMTPMessage framework is not compatible with the i386 architecture, which is used on iOS devices. The framework is designed to work with other architectures such as armv7 and arm64.
  • Another possible cause of this error could be a mismatch between the framework's configuration and the project settings. This can happen when the framework is imported into the project without considering the target device architecture.

🔧 Proven Troubleshooting Steps

Fixing the Framework Compatibility

  1. Step 1: Step 1: Identify the target device architecture for your iOS app. You can do this by going to the Target Membership tab in Xcode and selecting the 'Architecture' dropdown menu. Ensure that the selected architecture is compatible with the SKPSMTPMessage framework.
  2. Step 2: Step 2: Update the project settings to use a compatible architecture. In Xcode, go to the Project Navigator, select your project, and then click on the 'Build Settings' tab. Look for the 'Architectures' setting and ensure that it is set to 'armv7s' or 'arm64', depending on your target device.
  3. Step 3: Step 3: Clean and rebuild the project to ensure that the changes take effect.

Resolving Mismatch between Framework Configuration and Project Settings

  1. Step 1: Step 1: Check the framework's configuration settings to ensure they match the project settings. You can do this by opening the SKPSMTPMessage framework in Xcode, selecting the 'Target Membership' tab, and verifying that the selected architecture matches the one set in the project settings.
  2. Step 2: Step 2: Update the framework's configuration settings if necessary. If the framework is not compatible with the target device architecture, you may need to modify its configuration settings to use a different architecture.

💡 Conclusion

By following these steps and identifying the root cause of the issue, you should be able to resolve the 'Undefined symbols for architecture i386: _OBJC_CLASS_$_SKPSMTPMessage', referenced from: objc-class-ref in ConfirmController.o' error. Remember to always verify your project settings and framework configurations to ensure compatibility with your target device architecture.

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