A 'ModuleNotFoundError' typically indicates that Python cannot locate the specified module. Ensure that the module is installed, check your PYTHONPATH, or verify that you're using the correct module name in your import statement.

The 'ModuleNotFoundError' is a common issue encountered by Python developers, often arising when Python cannot find a specified module during the import process. This error can occur for several reasons, and understanding how to resolve it is crucial for smooth development. First, verify that the module you are trying to import is indeed installed in your Python environment. You can check this by using the pip package manager; for example, running pip show module_name will provide details about the installed package. If the module is not installed, you can install it using pip install module_name. Another possible cause is related to your PYTHONPATH, which is an environment variable that specifies the directories Python searches for modules. Ensure that the directory containing your module is included in this path. If you're working within a virtual environment, make sure it is activated to access the correct set of packages. Finally, confirm that you are using the correct module name in your import statement, including the correct casing, as Python is case-sensitive. By following these steps, you can effectively troubleshoot and resolve 'ModuleNotFoundError', ensuring your Python applications run smoothly.