maximum likelihood estimation in R

I want to find ML estimates of a model using mle2 in bbmle package. When I
insert new parameters (for new covariates) in model the log-likelihood value
does not change and the estimated value is exactly the initial value that I
determined. What's the problem? This is the code and the result:



As you see the estimated values for b2 , b3 and b4 are the initial values of
them. The log-likelihood value did not change!



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