B4J Question Create Collage

[microbox]

I'm trying to test the example code from @JordiCP to find out how it works. I need to create a program that will collage images from a folder and save as one file.

#Region Project Attributes
    #MainFormWidth: 600
    #MainFormHeight: 600
#End Region

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Private xui As XUI
    Private Button1 As B4XView
    Private ImageView1 As B4XView
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.RootPane.LoadLayout("Layout1")
    MainForm.Show
End Sub

Sub Button1_Click
    ''xui.MsgboxAsync("Hello World!", "B4X")
  
    Dim myBitmap(8) As B4XBitmap
    ' ... init them
    myBitmap.xui.LoadBitmapResize(File.DirAssets,"1.png", ImageView1.Width, ImageView1.Height, False)
    myBitmap.xui.LoadBitmapResize(File.DirAssets,"2.png", ImageView1.Width, ImageView1.Height, False)
    myBitmap.xui.LoadBitmapResize(File.DirAssets,"3.png", ImageView1.Width, ImageView1.Height, False)
  
    Dim scaleFactor As Float=1   ' or whatever
    Dim W As Int = scaleFactor*myBitmap(0).Width   ' We are assuming that all bitmaps have equal dimensions.
    Dim H As Int = scaleFactor*myBitmap(0).Height

    Dim totalW As Int = 4*W    ' Total width of 4*2 mosaic
    Dim totalH As Int = 2*H     ' Total height ...

    Dim b As B4XBitmap
    b.initializeMutable(totalW,totalH)
    Dim cv As Canvas
    cv.initialize2(b)
    For r=0 To 1
        For c=0 To 3
            Dim dstRect As Rect
            dstRect.initialize(c*W, r*H, (c+1)*W, (r+1)*H)     '<-- each bitmap will be in a position in the mosaic. No spacing between bitmaps here
            cv.drawBitmap( myBitmap(4*r+c), Null, dstRect)
        Next
    Next

    ' Now you have your bitmap in b and also in cv.bitmap. Can be saved to jpeg
    Dim o As OutputStream
    o=File.OpenOutput("c:\", "collage1.png",False)
    cv.Bitmap.WriteToStream(o,100,"PNG")    'or "PNG"
    o.Close
End Sub

But I'm getting this error

Unknown type: game: Are you missing a library reference?

I'm using library X2, jXUI, B4XCollections, jFx, jCore
What library am I missing?

 

[Erel]

When you use X2 you are expected to have a class named Game with a specific structure.