I have a problem in using DCchoice

I have installed DCchoice, Icens and aods3 packages and using them in calculating Willing To Pay from samples.

And I typed codes as follows ;

model2 <- asw1 + asw2 ~ 1 | log(bid1) + log(bid2)
model2_result <- dbchoice(model2, data = cvm_data, dist = "log-logistic")

Then an error message came as follows ;

Error in optim(ini, fn = dbLL, method = "BFGS", hessian = TRUE, dvar = yvar, : initial value in 'vmmin' is not finite

I do not know what the cause of this error message is and how can I solve this problem.

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