[![enter image description here](https://i.stack.imgur.com/ZoE8O.png)](https://i.stack.imgur.com/ZoE8O.png)

Getting Unknown attribute error on all android tag.

In layout XML, Auto suggestion is not showing all attributes (like layout\_width, layout\_height, orientation, orientation & all others android attributes.)

Things i have done to resolve this issue.

Clean Build & Rebuild
Deleted .idea file
Invalidated Caches/ Restart.. option
Turn On Power Save Mode.
SDk is up to date.

Unknown attribute android:orientation less. (Ctrl+F1) 
This inspection highlights unknown XML attributes in Android resource files and `AndroidManifest.xml`

currently using :

```
 Android studio 3.2.1
 targetSdkVersion 27
 ext.kotlin_version = '1.2.61'
 build:gradle:3.2.1

```

I tried with deleting .idea in the path and invalidate cache and restart ,synching the gradle