An important point to note while giving a historical run

The range of dates in run_timestamp should be such that it lies within the time series of the input files.

Meaning of this error

FATAL: From function set_date_i:Invalid date. Date=1850-02-00 00:00:00

There is a file in  the input going to the model which is not having a day stamp, i.e. it might be having the stamp like 185002 rather than 18500215 or 185002.5