diff -r 2d1c2b03ef3a src/mat/impls/aij/seq/aij.c
--- a/src/mat/impls/aij/seq/aij.c	Tue Apr 10 09:57:31 2012 -0500
+++ b/src/mat/impls/aij/seq/aij.c	Tue Apr 10 20:40:48 2012 +0300
@@ -3477,9 +3477,12 @@
   PetscErrorCode ierr;
 
   PetscFunctionBegin;
+  if (Ii[0]) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE, "Ii[0] must be 0 it is %D", Ii[0]);
+
+  ierr = PetscLayoutSetUp(B->rmap);CHKERRQ(ierr);
+  ierr = PetscLayoutSetUp(B->cmap);CHKERRQ(ierr);
+
   ierr = MatGetSize(B, &m, &n);CHKERRQ(ierr);
-
-  if (Ii[0]) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE, "Ii[0] must be 0 it is %D", Ii[0]);
   ierr = PetscMalloc((m+1) * sizeof(PetscInt), &nnz);CHKERRQ(ierr);
   for(i = 0; i < m; i++) {
     nz     = Ii[i+1]- Ii[i];