How do I implement multistart with lsqnonlin in my code?

I'm trying to find the parameter to describe the tansport of a chemical. I used lsqnonlin to find the value, but it returns the initial value. Hence, I wondered that if multistart can solve my problem.

The attachments are the data I used, and my code......

Answer 1

[Bruno Luong]

"it returns the initial value"

It indicates that the fit fails, not problem of wrong stating points (converge to local minima).