A DLL file from your DirectX installation is missing or has become damaged. The easiest thing to do is to reinstall the latest version of DirectX onto your system. If you need to have different versions installed for compatibility on different projects x3daudio1_7.dll is missing or you need to manage what platform components you need for existing installations, you can take care of it all in one place.
For More:
https://www.microsoftwindowssupportnumber.com/blog/fix-windows10-x3daudio1_7-dll-missing-error/