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This may happen if the package is not created properly or is not structured as per the Java package conventions. To resolve this issue, you can try the following:

1. Check that the package name matches the folder structure: The folder structure should match the package name. For example, if the package name is "com.example.package", the folder structure should be "com/example/package".

2. Create the package from the src folder: In Eclipse, packages should be created from the source folder. If you have created the package outside of the source folder, it may be regarded as a directory.

3. Refresh the project: This can be done by right-clicking on the project and selecting "Refresh". This should update any changes made to the project folder.

4. Try cleaning the project: In Eclipse, go to "Project" -> "Clean" and select the project you want to clean. This will rebuild the project and may resolve the issue.

If none of these methods work, you may need to create a new package with the correct folder structure and move your code into it.