what does this error mean?

[hzhatlboro]

Hi, can you please give me an idea what does the following error mean?  Thanks for your support! 

Traceback (most recent call last):
  File "pf2dtest.py", line 206, in ?
    S20+=s[k]*((.5*epsilon[counti,k]**2-.5*epsilon[j,k]**2)*(phases[k].getFaceGrad()).getDivergence \
TypeError: unsupported operand type(s) for *: 'float' and 'instancemethod'

The complete codes at lines 206 & 207 are:-

 S20+=s[k]*((.5*epsilon[counti,k]**2-.5*epsilon[j,k]**2)*(phases[k].getFaceGrad()).getDivergence \
                               +(omega[counti,k]-omega[j,k])*phases[k])

where s was defined as:-

s=[
    CellVariable(mesh=mesh, name='s0', value=(phases[0]>0)),
    CellVariable(mesh=mesh, name='s1', value=(phases[1]>0)),
    CellVariable(mesh=mesh, name='s2', value=(phases[2]>0)),
    CellVariable(mesh=mesh, name='s3', value=(phases[3]>0))
    ]

and phases was defined as:-

phases=[
    CellVariable(mesh=mesh, name='phi0', value=0),
    CellVariable(mesh=mesh, name='phi1', value=0),
    CellVariable(mesh=mesh, name='phi2', value=0),
    CellVariable(mesh=mesh, name='phi3', value=0)
    ]

epsilon and omega are constant matrices.

Thanks and regards,
hzhatlboro

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