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class Cu2OMaterial(object):
    def __init__(self):
        self.eps = 6.3*Unit.eps0
        self.affinity = 3.2*Unit.V
        self.Eg = 2.0*Unit.V
        kb = 1.3806503e-23
        T = 298.18
        hbar = 1.054571596e-34
        m_e=9.10938188*10**-31 #kg
        mh=.58*m_e #"Thin film deposition of Cu2O and application for solar cells"
        me=.99*m_e #Biccari thesis
        self.Nv=2.*(mh*kb*T/(2.*np.pi*hbar**2))**(3./2. )#m**-3
        self.Nc=2.*(me*kb*T/(2.*np.pi*hbar**2))**(3./2.) #m**-3
        self.ni = sqrt(self.Nc*self.Nv*exp(-self.Eg/(kb*T/1.602e-19))) * 1./100.**3.*pow(Unit.cm, -3.0)  
        self.mun = 100*Unit.cm*Unit.cm/Unit.V/Unit.s
        self.mup = 90*Unit.cm*Unit.cm/Unit.V/Unit.s
        self.tau = 1e-7*Unit.s

class ZnOMaterial(object):
    def __init__(self):
        self.eps = 9.0*Unit.eps0 #Sze
        self.affinity = 4.2*Unit.V
        self.Eg = 3.3*Unit.V
        kb = 1.3806503e-23
        T = 298.18
        hbar = 1.054571596e-34
        m_e=9.10938188*10**-31 #kg
        mh=.59*m_e #"Zinc Oxide Nanostructures: Synthesis and Properties" Zhiyong Fan and Jia G. Lu
        me=.27*m_e #Sze
        self.Nv=2.*(mh*kb*T/(2.*np.pi*hbar**2))**(3./2. )#m**-3
        self.Nc=2.*(me*kb*T/(2.*np.pi*hbar**2))**(3./2.) #m**-3
        self.ni = sqrt(self.Nc*self.Nv*exp(-self.Eg/(kb*T/1.602e-19))) * 1./100.**3.*pow(Unit.cm, -3.0)
        self.mun = 200*Unit.cm*Unit.cm/Unit.V/Unit.s #"Zinc Oxide Nanostructures: Synthesis and Properties" Zhiyong Fan and Jia G. Lu
        self.mup = 30*Unit.cm*Unit.cm/Unit.V/Unit.s #"Zinc Oxide Nanostructures: Synthesis and Properties" Zhiyong Fan and Jia G. Lu
        self.tau = 1e-7*Unit.s

$ python fitLevel49.py
...
  File "BSIM3v3.py", line 684, in _DC_Curr
    for v in output:
NameError: global name 'output' is not defined