Add error tooltip

interface/resources/qml/AssetServer.qml

@@ -606,6 +606,14 @@ ScrollingWindow {
                        
                         elide: Text.ElideRight
                         horizontalAlignment: TextInput.AlignHCenter
+
+                        HifiControls.ToolTip {
+                            anchors.fill: parent
+
+                            visible: styleData.value === "Error"
+
+                            toolTip: assetProxyModel.data(styleData.index, 0x106)
+                        }
                     }
                 }
                 Component {

interface/resources/qml/controls-uit/ToolTip.qml

@@ -0,0 +1,51 @@
+//
+//  ToolTip.qml
+//
+//  Created by Clement on  9/12/17
+//  Copyright 2017 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+import QtQuick 2.5
+
+Item {
+    property string toolTip
+    property bool showToolTip: false
+
+    Rectangle {
+        id: toolTipRectangle
+        anchors.right: parent.right
+
+        width: toolTipText.width + 4
+        height: toolTipText.height + 4
+        opacity: (toolTip != "" && showToolTip) ? 1 : 0
+        color: "#ffffaa"
+        border.color: "#0a0a0a"
+        Text {
+            id: toolTipText
+            text: toolTip
+            color: "black"
+            anchors.centerIn: parent
+        }
+        Behavior on opacity {
+            PropertyAnimation {
+                easing.type: Easing.InOutQuad
+                duration: 250
+            }
+        }
+    }
+    MouseArea {
+        id: mouseArea
+        anchors.fill: parent
+        onEntered: showTimer.start()
+        onExited: { showToolTip = false; showTimer.stop(); }
+        hoverEnabled: true
+    }
+    Timer {
+        id: showTimer
+        interval: 250
+        onTriggered: { showToolTip = true; }
+    }
+}