What's wrong with this VERY BASIC VB script?

[Guest]

Sub or Function: MainSub
Parameters: "My Test Script"

Public Sub MainSub(ByVal MyParam As String)
          hs.WriteLog("Test") 'log the code entry
End Sub

It throws an error!

Running script MyScript.vb :Object reference not set to an instance of an object.->Does entry point MainSub() exist in script? at Scheduler.clsRunVBNetScript.ExecuteScript()

At the end, I would like the WriteLog to output my Parameter, but I can't even get this basic script to work!

[zwolfpack]

hs.WriteLog() wants two parameters: first one will appear in the 'Type' column, the second in the 'Message' column.

So try

hs.WriteLog("MyScript", "This is the message that I want to log")

[Guest]

hs.WriteLog() wants two parameters: first one will appear in the 'Type' column, the second in the 'Message' column.

So try

hs.WriteLog("MyScript", "This is the message that I want to log")

Thank you!!!