References to other resources are not supported by build-time PNG generation

To support API SDK < 24 add the following line to your app build.gradle inside the android block:

defaultConfig {
   vectorDrawables.useSupportLibrary = true
}

If your minSdkVersion is 24 or higher, then your issue will be resolved on its own, because VectorDrawables have full support starting with this API.

See Android Developers: Vector Drawables Backward Compatibility Solution for details.

you need to use the hex code directly not referring to a resource.

<vector
  <path
    android:fillColor="#FFF"/></vector>

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