database connectivity issue at code

[repath]

Dear Djoualla,
I tried to download and open .xer file from the given command button., after selecting the file, I get an error labelled "catastrophic failure" - Runtime error "-2147418113" and has a debug option, when I clicked on debug option, the following is the area displayed: "cnn.open" is where the debugger stopped.
Can you please help.

cnn.ConnectionString = "Driver={Microsoft Excel Driver (*.xls, *.xlsx, *.xlsm, *.xlsb)};DBQ=" & _
ActiveWorkbook.Path & Application.PathSeparator & ActiveWorkbook.Name & ";"

**cnn.Open**
Application.StatusBar = "Select Project"
With Worksheets("dashboard")
    .Cells(1, 40) = "Project_Name"
    .Cells(1, 39) = "Project_ID"

with regards and thanks,
Repath Athyala.