Error: Can't show mds autonaming file

Hi guys,
I'm facing a error when working in MDS module. I can not open the window to set Autonaming for MDS Zone. This is my error:

(2,751)   Variable !!PDMSDFLTS does not exist
In line 103 of PML function mdsautoname.SHOWFILES
 !SplitDflts = !!pdmsdflts.split(' ')
Called from line 1 of Command/Form Callback Command
!This.showfiles()
Called from line 1 of Command/Form Callback Command
show !!mdsautoname

can you help me?

Cheer,

Dear guys,
I have already fix this error. there is a wrong in my project evar file.
Thank so much.

Kindly Please explain how did you solve this above error?..I am also facing same error..

Copy all item (except the folder) from directory Project/AvevaCatalogue/acpdflts. 

The files kind of : 

DES-SUPP-NAMES

DRA-MDS-ABA-DEFAULTS

MdsUserData.pmldat

into your XXXDFLTS. XXX is your initial Project.