dir function is not working on colleagues PC

The error message is basicly that the name he is looking for cannot be found within the given path.
It just stops the macro; no blue screens, no excel closings.

The code is the following:

Sub whsopss()
'
' whsopss Makro
'
Dim path As String
Dim path_drei As String
Dim Datum As Long
Dim timestamp As String

'datumsabhängigen whsops Name in Variablen Name einlesen

Datum = Format(Date, "YYYYMMDD")
path = "T:\Reports\Rueckstand\"
timestamp = Dir(path & "whsopsstatus_" & Datum & "*.csv*")
path = path & timestamp