help with SYSTAT nonlin

i'm having trouble estimating parameters for a mixture of 2 normal distributions In SYSTAT. I'm using NONLIN; specified the model and the negative log likelihood of the mixture function in the loss function statement using the preprogrammed ZDF function. But I can't seem to get the program to include the estimate from the model in the loss function, and the estimates it's producing don't make any sense.

thanks in advance!