addfile cannot read NetCDF file

[Amirhossein Nikfal]

Code
addfile with read-write status parameter:

f = addfile("era5_file.nc","w")
print(f)

Output

Variable: f
(0) File Missing Value : -1

f = addfile("era5_file.nc","r") does not have any problem.

OS: Fedora 36
NCL version: 6.6.2