PDF creation error

[Stefano Fachin]

dear all,

Lyx (last version, fresh installation just carried out, with Miktex also 
updated) seems unable to compile (that is, no PDF, no DVI, no HTML, 
nothing). The process is stopped with the following Latex error:

**********************************************************************

\IFTEX at let

{vtexdvi}{false}

The control sequence at the end of the top line

of your error message was never \def'ed. If you have

misspelled it (e.g., `\hobx'), type `I' and the correct

spelling (e.g., `I\hbox'). Otherwise just continue,

and I'll forget about whatever was undefined.


**********************************************************************

This is associated wth the package ifvtex, as the registry shows the 
warning "Package: ifvtex 2019/10/25 v1.7 ifvtex legacy package. Use 
iftex instead." This is one of the sty files Miktex collects in \MiKTeX 
2.9\tex\generic\iftex.


Any hints? thanks,

Stefano



-- 
_________________________________________________________________________

Stefano Fachin
Professore Ordinario di Statistica Economica
Dip. di Scienze Statistiche
Università di Roma "La Sapienza"
P.le A. Moro 5 - 00185 Roma - Italia
Tel. +39-06-49910834
fax  +39-06-49910072
webhttp://stefanofachin.site.uniroma1.it/


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