Can't open parameter file....error in artwork creation

Hello,

 I set general parameter (as usual) with metric 2:5 274X

When I create artwork I've this log

Can't open parameter file ... using default values:

     DEVICE-TYPE        GERBER6X00

     G-CODES            NO

     STATIONS-PER-WHEEL 24

     FILM-SIZE          24000 16000

     COORDINATES        ABSOLUTE

     OUTPUT-UNITS       INCHES

     FORMAT             5.3

     ABORT-ON-ERROR     abort film & continue

     SUPPRESS-LEAD-ZEROES     YES

     SUPPRESS-TRAIL-ZEROES    NO

     OPTIMIZE           YES

     SUPPRESS-EQUAL     YES

     SCALE              1.0

Orcad creates a art_param.txt file like this
DEVICE-TYPE           GERBER_RS274X
OUTPUT-UNITS          MM
FILM-SIZE             24000000 16000000
FORMAT                4.6
ABORT-ON-ERROR        NO
SCALE                 1
SUPPRESS-LEAD-ZEROES  YES
SUPPRESS-TRAIL-ZEROES NO
SUPPRESS-EQUAL        YES
UNDEF-APT-CONT        NO

but if I create new artwork Orcad doesn't find it anyway

any ideas?

thanks

Stefano