Fixing Runtime Error: Resolving Module Compiled Against API Version 0xb When Numpy Version is 0xa

This guide will help you resolve the runtime error that occurs when a module is compiled against NumPy API version 0xb, but your installed NumPy version is 0xa. This error is commonly encountered when using Python libraries that depend on NumPy, such as SciPy, scikit-learn, and TensorFlow. We'll walk you through the steps to fix this error and provide answers to frequently asked questions related to this issue.

Table of Contents

  1. Prerequisites
  2. Understanding the Error
  3. Step-by-step Solution
  4. FAQs
  5. Related Links


Before proceeding, ensure you have the following software installed:

  1. Python (version 3.6 or higher)
  2. Pip (Python package manager)

To check the installed versions, open a terminal or command prompt and run the following commands:

python --version
pip --version

Understanding the Error

The error message typically looks like this:

RuntimeError: module compiled against API version 0xb but this version of numpy is 0xa

This error occurs when a Python module is built against a different NumPy API version than the one installed in your environment. In this case, the module is compiled against API version 0xb (1.11.x), but your installed NumPy version is 0xa (1.10.x).

To fix this error, you need to upgrade your NumPy version to match the API version required by the module.

Step-by-step Solution

Follow these steps to resolve the error:

Step 1: Check your current NumPy version

First, check your existing NumPy version by running the following command:

pip show numpy

Take note of the version number displayed in the Version field. If it's lower than 1.11, proceed to the next step.

Step 2: Upgrade NumPy

Upgrade NumPy to version 1.11.x or higher by running the following command:

pip install --upgrade numpy

This will install the latest compatible NumPy version for your Python environment.

Step 3: Verify the new NumPy version

After upgrading, check your new NumPy version by running the pip show numpy command again. Ensure that the version number is now 1.11.x or higher.

Step 4: Test your code

Run your Python code again to verify that the error has been resolved. If you still encounter the error, you may need to reinstall the affected Python module(s) or upgrade other dependencies.


How do I check my installed Python packages and their versions?

Run the following command to list all installed Python packages and their versions:

pip list

How can I downgrade NumPy to a specific version?

If you need to downgrade NumPy to a specific version, use the following command, replacing x.y.z with the desired version number:

pip install numpy==x.y.z

Can I install multiple versions of NumPy in the same environment?

No, you can't install multiple versions of NumPy in the same Python environment. However, you can use virtual environments to create isolated Python environments with different NumPy versions installed.

What if upgrading NumPy causes compatibility issues with other packages?

If upgrading NumPy results in compatibility issues with other packages, consider using conda to manage your Python environment. Conda is a package manager that can automatically resolve conflicts between package versions and dependencies.

How can I prevent this error from happening in the future?

To prevent this error, always use the latest stable version of Python and its packages. Regularly update your packages using pip or conda and make sure to update your code to use the latest APIs.

  1. NumPy Official Documentation
  2. Python Virtual Environments Guide
  3. Conda Package Manager
  4. Handling Import Errors in Python

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