cannot find virtual device on android studio 3 windows 10

Issue

I am relatively new to Android development and i recently downloaded Android Studio on my Windows 10 machine. But i am facing some problems. When i create a new project, in the activity_main.xml design tab I cannot see any virtual device. All i see is a message that says Design Editor unavailable until successful build. When I click on build,I don't see any message regarding the build in the IDE log. I have the AVD manager installed and i have also created a virtual device. Also when i edit the RUN configuration, it asks me to select a module but in the drop down window it says no module

Solution

**Just update your repositories by clicking on install missing platforms and sync project, i hope that will help **

Answered By - Ajinkya Bhalerao