No system resource manager for module: app in android studio 3.1 The problem when it android studio android 3.1 I have unfortunately entered into the finish inbuild library files after, it shows download or refreshes if u already downloaded, I used download after that this error is coming.
that filename activity.xml
Resource Manager is a tool window for importing, creating, managing, and using resources in your app. You can open the tool window by selecting View > Tool Windows > Resource Manager from the menu bar or by selecting Resource Manager on the left side bar.
Let's try File > Sync project with Gradle . In my case, it works well.
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