The pesky "Object variable or With block variable not set" error

I've been searching online for clues on how to fix this error (there are plenty of cases)... but I can't find any example that would really help figure this one out. I'm getting the "Object variable or With block variable not set" error when I click on my click button.

Public ConnectMM As Object
Public GraphletsMM As Object

Sub Gather()
 
    On Error GoTo Recover
    
    Dim x
    
    InitializeEP
    Application.Cursor = xlWait
    x = ThisWorkbook.ConnectMM.ReadTableVec(Worksheets("Main Table").Range("B3"), Worksheets("Main Table").Range("B4"), 0, 3, 0, Worksheets("Main Table").Range("c3:k27"))
    Application.Cursor = xlDefault
    If x <> "OK" Then MsgBox x
    
    Exit Sub
    
Recover:
    If Err.Number = 424 Then
        InitializeEP
        Resume
    Else
        MsgBox Err.Description
        Application.Cursor = xlDefault
    End If
End Sub

Any assistance would be greatly appreciated.

Thanks!
Pedro