How to fix "Run-time error '380': Could not set the RowSource property."

I have used the exact same code below for different sheets and it works correctly, but when I edited it for a new set of sheets in the same workbook the Run Time error comes up.

Private Sub cmdSearchKitDesc_Click()

Dim RowNum As Long
Dim SearchRow As Long

RowNum = 3
SearchRow = 3

Worksheets("Kit_database").Activate

Do Until Cells(RowNum, 1).Value = ""
    If InStr(1, Cells(RowNum, 3).Value, txtKitKeyword.Value, vbTextCompare) > 0 Then
        Worksheets("Kit_search").Cells(SearchRow, 2).Value = Cells(RowNum, 2).Value
        Worksheets("Kit_search").Cells(SearchRow, 3).Value = Cells(RowNum, 3).Value
        Worksheets("Kit_search").Cells(SearchRow, 4).Value = Cells(RowNum, 4).Value
        Worksheets("Kit_search").Cells(SearchRow, 5).Value = Cells(RowNum, 6).Value
        Worksheets("Kit_search").Cells(SearchRow, 6).Value = Cells(RowNum, 8).Value
        Worksheets("Kit_search").Cells(SearchRow, 7).Value = Cells(RowNum, 9).Value
        SearchRow = SearchRow + 1
    End If
    RowNum = RowNum + 1
Loop
If SearchRow = 2 Then
    MsgBox "No kits were found that match your criteria."
    Exit Sub
End If

lstKitResult.RowSource = "KitKit"

End Sub

I have changed RowNum to 3 to match the column of the sheet (in this case I would like to search the description of a kit) I would like to search and respectively in the string. I have carefully checked that the sheets and OFFSET function that it uses are named correctly.

The list box I would like to populate uses, lstKitResult.RowSource = "KitKit" where "KitKit" uses the following OFFSET formula, =OFFSET(Kit_search!$B$3,0,0,COUNTA(Kit_search!$C:$C)-1,6)

The "Kit_database" sheet holds all the different types of kits I would search from. The "Kit_search" sheet is a placeholder for all the results found that match the kit description searched. The OFFSET function pulls data "Kit_search" that should be populated with the search results of txtKitKeyword.Value

I have tried different column numbers and sheet names to make sure that things match up but the Run Time error always comes up.