The application could not be installed: INSTALL_PARSE_FAILED_MANIFEST_MALFORMED

This error message usually appears when there is a problem with the app's manifest file. The manifest file is an XML file that contains important information about the app, such as its activities, permissions, and other components.

Here are some possible solutions to fix this error:

1. Check the manifest file for errors: Open the manifest file in a text editor and look for any syntax errors or missing elements. Make sure that all the required elements are present and properly formatted.

2. Check the package name: Make sure that the package name in the manifest file matches the package name in your project's build.gradle file.

3. Clean and rebuild the project: Sometimes, the error can be caused by a corrupted build. Try cleaning and rebuilding the project to see if that fixes the problem.

4. Check the SDK version: Make sure that the target SDK version in the manifest file is compatible with the device you are trying to install the app on.

5. Check the permissions: Make sure that the app has all the necessary permissions listed in the manifest file.

6. Try disabling Instant Run: If you are using Android Studio, try disabling Instant Run and see if that fixes the issue.

If none of these solutions work, you may need to seek further assistance from the Android developer community or the app developer.