I4DVAR - Negative Ritz value found

[smartboy]

I have run the I4DVAR tutorial in WC13 application successfully to help me understand ROMS 4DVAR.
Then, I built up my own NLM application successfully without variational data assimilation. However, when I define I4DVAR in my header file to open the variational data assimilation in my application. The model blow up. The reason is that negative Ritz value is found.
I'm confused about what's wrong with my application. In my application, the header file is almost same as WC13. The difference between my application and WC13 testing case is that ADJUST_BOUNDARY, ADJUST_WSTRESS and ADJUST_STFLUX are not defined. All the files are created for variational data assimilation according to WC13 I4DVAR tutorial.
The header file and running log file of my application are listed below. Is anyone can help me find out this problem?