I'm using Mathematica 13.3.0.0.
I've downloaded the wl file to C:\Users\ianww\Documents\Mathematica\BernDirac.wl
I run:
ClearAll["Global`*"]
Get["C:\\Users\\ianww\\Documents\\Mathematica\\BernDirac.wl"]
I try (using esc ket esc to create the ket operator):

but I get a failed error:
$Failed
I also get the error if I comment out //MatrixForm:

$Failed
I get the same error if I try to run your example file.
I've also tried using Import rather than Get:
Import["C:\\Users\\ianww\\Documents\\Mathematica\\BernDirac.wl", "Rules"]
and it shows the file is loading ok because I get a comprehensive list of rules. However, the same $Failed error occurs.
Do you know if your wl is compatible with Mathematica 13.3.0.0? Or could there be some other cause that I've missed?
I'm using Mathematica 13.3.0.0.
I've downloaded the wl file to
C:\Users\ianww\Documents\Mathematica\BernDirac.wlI run:
I try (using esc ket esc to create the ket operator):
but I get a failed error:
$FailedI also get the error if I comment out
//MatrixForm:$FailedI get the same error if I try to run your example file.
I've also tried using
Importrather thanGet:Import["C:\\Users\\ianww\\Documents\\Mathematica\\BernDirac.wl", "Rules"]and it shows the file is loading ok because I get a comprehensive list of rules. However, the same
$Failederror occurs.Do you know if your wl is compatible with Mathematica 13.3.0.0? Or could there be some other cause that I've missed?