Import a parameter from GDX file

GAMS
1

Hello
I am trying to import a parameter through MATLAB within a GDX file.

$GDXIN 'data.gdx'
Set
   bus        / 1*14   /
   slack(bus) / 1     /
parameter
Inc(*,*);
$load Inc
$GDXIN

I get the error (error 492): Symbol not in GDX
While I have a parameter named Inc in data.gdx file as shown below.
image.png
what is wrong here?
It is worth mentioning there is not any problem with importing the set shown in the GDX file
Screenshot 2021-06-16 174244.png

2

I do not know why this post is not shown in recent posts! could anyone help me with this, please?

3

The GDX file is not so large. Perhaps you could attach it.

-Steve

4

it is a test model, Sir. I want to enter a large parameter