sage: K = GF(7); K
Finite Field of size 7
sage: sage: phi = End(K^2)([[1,1],[1,1]])
sage: phi
Vector space morphism represented by the matrix:
[1 1]
[1 1]
Domain: Vector space of dimension 2 over Finite Field of size 7
Codomain: Vector space of dimension 2 over Finite Field of size 7
sage: 2*phi
Vector space morphism represented by the matrix:
[2 2]
[2 2]
Domain: Vector space of dimension 2 over Finite Field of size 7
Codomain: Vector space of dimension 2 over Finite Field of size 7

sage: K(2)*phi
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-35-81e4c450e31e> in <module>()
----> 1 K(Integer(2))*phi

/opt/sage-git/local/lib/python2.7/site-packages/sage/structure/element.so in sage.structure.element.RingElement.__mul__ (build/cythonized/sage/structure/element.c:15355)()

/opt/sage-git/local/lib/python2.7/site-packages/sage/structure/coerce.so in sage.structure.coerce.CoercionModel_cache_maps.bin_op (build/cythonized/sage/structure/coerce.c:8323)()

TypeError: unsupported operand parent(s) for '*': 'Finite Field of size 7' and 'Set of Morphisms (Linear Transformations) from Vector space of dimension 2 over Finite Field of size 7 to Vector space of dimension 2 over Finite Field of size 7'

sage: phi.characteristic_polynomial()(phi)
...
TypeError: unsupported operand parent(s) for '*': 'Finite Field of size 7' and 'Set of Morphisms (Linear Transformations) from Vector space of dimension 2 over Finite Field of size 7 to Vector space of dimension 2 over Finite Field of size 7'