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Error

Error

(OP)
Hi
This the first time I am working with Nastran
while training, I tried to run the truss1 sample
But After running the software when I check the f06 output file I see this error:

*** USER FATAL MESSAGE 9994 (BULKIN)
First Field Violation near line 20
First Field Parent identification string "GRID 1 0" must be contiguous, check start of field two.


I copy the data file from Nastran guide, this is the part that seems to have a problem:
$ THE GRID POINTS LOCATIONS
$ DESCRIBE THE GEOMETRY
$
GRID 1 0. 0. 0. 3456
GRID 2 0. 120. 0. 3456
GRID 3 600. 120. 0. 3456
GRID 4 600. 0. 0. 3456
$
$ MEMBERS ARE MODELED USING

Any body has any idea what this error means?

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