Beta is not defined error

[Ahmet Heperkan]

Hello everyone. I'm getting Beta not defined error. do you know how I can fix this? 

#Parameters to be estimated

#Base alternative is alternative1, set ASC1 to 0 in the utility function

 

ASC1 = Beta('ASC1',0,-10,10,1)

ASC2 = Beta('ASC2',0,-10,10,0)

ASC3 = Beta('ASC3',0,-10,10,0)

[Bierlaire Michel]

You forgot to import the expressions;

from biogeme.expressions import Beta

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