[petsc-users] fieldsplit: Unhandled case, must have at least two fields, not 1!

[Mark Adams]

>
>
> So this is a different KSP; not the one you want to use fieldsplit on?
>

Yes,


>
> Please always use different prefixes for different solvers.
>

We use prefixes.  I left them out of the example.  So things like
'-s2_pc_type fieldsplit' cause an error.  The 's2_' solver is a one field
(Laplacian) solve.
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