[ADMB Users] Error message

Hai Che haiche.email at gmail.com
Tue Jan 29 21:49:28 PST 2013

Dear all,

I kept getting the error message:

Attempting to take the derivative of sqrt(prevariable x) at x=0

after 30-40 iterations using ADMB. I tried different starting values and
etc. Nothing helped. Could you help providing some suggestions on this

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