Lists, what am I doing wrong?

Sub Globals
   Dim mainList As List
End Sub

Sub Activity_Create(FirstTime As Boolean)
   mainList.Initialize
   mainList = GetMyData
End Sub

Sub GetMyData
   Dim workList as List
   workList.Initialize
   workList.Add("Hello")
   return workList
End Sub

Parsing code. 0.01
Compiling code. 0.05
Compiling layouts code. 0.01
Generating R file. 0.49
Compiling generated Java code. Error
B4A line: 53
mainList = GetMyData
javac 1.7.0_05
src\b4a\example\main.java:276: error: inconvertible types
mostCurrent._mainchannels.setObject((java.util.List)(mostCurrent._dbstuff._getchannels(mostCurrent.activityBA)));
^
required: List
found: String

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