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Unfortunately, this is the long standing bug #27492: parallelized computations involving symbolic functions are failling in SageMath. In your case, the symbolic functions are introduced in the line h[i,j]=function(f'h{i}{j}')(t, x, y, z). If you switch off parallelization via

Parallelism().set(nproc=8)

there should be no issue (albeit the computation will be quite long...)

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No.2 Revision

Unfortunately, this is the long standing bug #27492: parallelized computations involving symbolic functions are failling in SageMath. In your case, the symbolic functions are introduced in the line h[i,j]=function(f'h{i}{j}')(t, x, y, z). If you switch off parallelization via

Parallelism().set(nproc=8)
Parallelism().set(nproc=1)

there should be no issue (albeit the computation will be quite long...) long...)