VFP to doesn't launch Ms Word's mailmerge

[Jay9988]

Hi All,
I have an application to launch MS Word mailmerge.
It is using VFP class: mailmrge.vcx
with this command

WITH THISFORM._mailmerge
    .cAppTitle = "Kontrak Sewa"    && application name, used in Alerts 
    .nWordProc = 1                    && word processor (1 = Word 6+; 2 = CommaDelim; or user-defined (see below); default = 1)
    .nNewDoc = 2                    && is it a new doc (1 = new, 2 = existing; default = 1)
    .cdocname=mdrive+mfile
    .nTemplate = 1                    && type of main document (Word only, 1 = form letter; 2 = label; 3 = envelope; 4 = catalog; default = 1)
    .cAlias = ALIAS()                && alias of source table or view
    ACOPY(aflds, .aAutoFields)        && fill in array of field names to be used
    .MakeOutput()                    && do the merge
   ENDWITH

But, in several PCs the Word window doesn't launch. In other PCs works fine... The VFP ODBC driver has been installed in all the PCs

Is it anything related to Office version? Because I have 2 PC's, both using Word 2013. The one pc is work fine, and the other pc Word doesn't launch.

Does anyone know the problem ?

Many thanks