"QtMultimedia" version 5.15 is not installed

If you encounter the error message "QtMultimedia version 5.15 is not installed" while using QML, it means that the Qt Multimedia module is not available or not installed in your development environment.

To resolve this issue, you can follow these steps:

1. Make sure you have Qt development libraries installed that include the Qt Multimedia module. If you are using Qt Creator, you can check if the module is available by going to "Help" -> "About Plugins" -> "Installed" tab, and see if "Multimedia" is listed.

2. If the Qt Multimedia module is not installed, you may need to install it separately. The process for installing the module depends on your operating system and the version of Qt you are using. Refer to the Qt documentation or your operating system's package manager for instructions on how to install the Qt Multimedia module.

3. After installing the Qt Multimedia module, make sure to update your project configuration file (.pro or .pri file) to include the Qt Multimedia module in your project. Add the following line to your project file:

   QT += multimedia

4. Rebuild your QML project to ensure that the changes take effect.

By following these steps, you should be able to resolve the issue and use the Qt Multimedia module in your QML application.