Inspector shows error on startup

[mbektchiev]

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• iOS Runtime: 6.3.0
• iOS Inspector: 6.3.0

Describe the bug
When Inspector app opens up it displays the following internal error:

TypeError:​ InspectorFrontendHost.setSheetRect is not a function. (In 'InspectorFrontendHost.setSheetRect(mainElementRect.x, mainElementRect.y, mainElementRect.width, mainElementRect.height)​', 'InspectorFrontendHost.setSheetRect' is undefined)​ (at Main.js:​1684:​39)​
    ?​ @ Main.js:​1684:​39
    ?​ @ Main.js:​584:​24

To Reproduce
Run tns debug ios --inspector