hello i’m using the codes posted in “unifycommunity.com” error says “Assets/Standard Assets/Scripts/GUILayout1.cs(258,39): error CS0103: The name `GUILayoutx’ does not exist in the current context” can someone help me 
I’m using this File Browser too. If you read the very first line on top of the page, it reads:
“Note: This code uses the
ImprovedSelectionList”
Clicking the link takes you to ImprovedSelectionList’s Wikisite, which, as you’ll notice, is the source code for GUILayoutx. You need to copy paste that code to an empty class you create in the project. Then the error will go away.