I wonder whether you intend to turn on the run-time IO option? If to, please remove the line:
"iofield_list.txt"
The error message also nindicates that wrflowinnp cannot be opened for writing. Can you manually type the lines below:
auxinput4_inname = "wrflowinp_d<domain>"
auxinput4_interval = 360
io_form_auxinput4 = 2
Then try again? I ask this because sometimes when we copybthe above lines from online document, somehow the format can be implicitly changed.
Please try and hope it works.
Other than the above issue, I don't see anything wrong in your namelist.input