Macro Code To Add More Rows To Existing Chart

I have managed to create something similar to what i am working for using an example from Lacher and Gant Charts. i am now stuck as I can enter more than 40 status as it then gives me an error. The following is the code: Can any1 highlight where i need to make any changes to stop the error from occuring:

Option Explicit
Sub CreateTimeChartData()
Dim vTimeData As Variant
Dim i As Integer
Dim sRoom As String
Dim vLastEndTime As Variant
Dim oSeries As Series
' set up
Application. ScreenUpdating = False
Application.DisplayAlerts = False
' create chart data worksheet
With Worksheets("TimeData"). Range("TimeList"). CurrentRegion
.Sort Key1:="Room", Key2:="Start Time", Header:=xlYes
vTimeData = .Value
Worksheets.Add
On Error Resume Next
Worksheets("ChartData").Delete..........................