Errors in Mathematica 14.3

[Elena Simón]

Hi! 

I tried to use xAct`xTensor`in the new version of Mathematica 14.3 and I am getting a lot of errors. I saw some other comments in the group on how to solve some of them with these lines: 

xAct`xTensor`Commutator;
xAct`xTensor`Anticommutator;

But I am still getting these errors: 

[Thomas Bäckdahl]

Hi!

From the messages it looks like Mathematica can not find all files of the installation of xAct.

Can you check if xCore.m is located in
C:\Users\YourUserName\AppData\Roaming\Wolfram\Applications\xAct\xCore
(If you use Windows)
Also a file init.m should be located in
C:\Users\YourUserName\AppData\Roaming\Wolfram\Applications\xAct\xCore\Kernel

If you extract the content of
https://xact.es/download/xAct_1.2.0.zip
to
C:\Users\YourUserName\AppData\Roaming\Wolfram\Applications
all files should be in the right place.
Also check that
the command $Path i Mathematica list your installation folder (C:\Users\YourUserName\AppData\Roaming\Wolfram\Applications)

Regards
Thomas

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[Leo B]

Hello everyone 😁

I had the same error and I fixed it using:


(*Arreglo del problema 13.+ *)

(*1. Quitar protección y borrar símbolos doble definición*)
Unprotect[Commutator, Anticommutator];
ClearAll[Commutator, Anticommutator];
Remove[Commutator, Anticommutator];

(*Llamar a XAct*)

<< xAct`xTensor`
<< xAct`xCoba`

I don't know if it's completely correct but it has helped me not to have those messages, I let XAct define its own commands, apparently for Mathematica 14.3+ it has some problems because it defines those functions and when calling the package, it also wants to define them.

Leonel. Greetings.

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De: xa...@googlegroups.com <xa...@googlegroups.com> en nombre de Elena Simón <ele...@gmail.com>
Enviado: Thursday, October 23, 2025 1:57:00 AM
Para: xAct Tensor Computer Algebra <xa...@googlegroups.com>
Asunto: [xAct] Errors in Mathematica 14.3