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

[Mark Adams]

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> [0]PETSC ERROR: Petsc has generated inconsistent data!
> [0]PETSC ERROR: Unhandled case, must have at least two fields, not 1


This can happen if you give fieldsplit options to a non-fieldsplit
matrix/PC. So so calling XXXSetFromOptions with a KSP/PC and an AIJ Mat
(ie, non-nested Mat)  and using a parameter like '-pc_fieldsplit_type
schur', will give you this error.
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