There is no access path from your front end to data carrier &

What causes this issue?

If original application data is stored on another computer, you need
special data for your specific combination of frontend computer and
data carrier in order to transfer original application data. This data
is defined in the IMG for document management, step "Define mount
points/logical drives".

System Response

No access path is defined for the combination of computers you are
using.

How to fix this error?

Contact your system administrator to have an access path defined for
the combination of computers you are using.
Note:
If the original application files are on a local computer, you do not
need to enter a computer in the <LS>Data carrier</> field. However, if
you did make an entry, disregard this message. Confirm the message. You
see the dialog box for selecting a file.

Error message extract from SAP system. Copyright SAP SE.