Cannot overlay vectors on a map properly

Dear NCLers

Anytime I try to plot a vector map using the script attached, I get the
following error:

(0) is_valid_latlon2d_attr: Warning: The 'lat2d' attribute must either
be the same dimension sizes as the data, or one element larger in both
directions. Your data will most likely not be overlaid on the map
correctly.
(0) check_for_y_lat_coord: Warning: Data either does not contain a
valid latitude coordinate array or doesn't contain one at all.
(0) A valid latitude coordinate array should have a 'units' attribute
equal to one of the following values:
(0) 'degrees_north' 'degrees-north' 'degree_north' 'degrees north'
'degrees_N' 'Degrees_north' 'degree_N' 'degreeN' 'degreesN' 'deg north'
(0) is_valid_latlon2d_attr: Warning: The 'lon2d' attribute must either
be the same dimension sizes as the data, or one element larger in both
directions. Your data will most likely not be overlaid on the map
correctly.
(0) check_for_lon_coord: Warning: Data either does not contain a valid
longitude coordinate array or doesn't contain one at all.
(0) A valid longitude coordinate array should have a 'units' attribute
equal to one of the following values:
(0) 'degrees_east' 'degrees-east' 'degree_east' 'degrees east'
'degrees_E' 'Degrees_east' 'degree_E' 'degreeE' 'degreesE' 'deg east'

I have been searching in the website but could not find any solution. Could
you help me to figure this out? The script is attached and here is what the
output of the ncdump command looks like.
Thanks.

netcdf Africa_199908.MMEAN {
dimensions:
        x = 253 ;
        y = 217 ;
        plev = 13 ;
        time = UNLIMITED ; // (1 currently)
variables:
        float xlon(y, x) ;
                xlon:long_name = "Longitude at cross points" ;
                xlon:units = "degrees_east" ;
                xlon:standard_name = "longitude" ;
                xlon:_CoordinateAxisType = "Lon" ;
        float xlat(y, x) ;
                xlat:long_name = "Latitude at cross points" ;
                xlat:units = "degrees_north" ;
                xlat:standard_name = "latitude" ;
                xlat:_CoordinateAxisType = "Lat" ;
        double plev(plev) ;
                plev:long_name = "Interpolated pressure" ;
                plev:units = "hPa" ;
                plev:axis = "Z" ;
        double time(time) ;
                time:units = "hours since 1949-12-01 00:00:00" ;
                time:calendar = "standard" ;
        float topo(y, x) ;
                topo:long_name = "Domain surface elevation" ;
                topo:standard_name = "surface_altitude" ;
                topo:units = "m" ;
                topo:coordinates = "xlon xlat" ;
        float mask(y, x) ;
                mask:long_name = "Domain land/ocean mask" ;
                mask:standard_name = "landmask" ;
                mask:units = "1" ;
                mask:coordinates = "xlon xlat" ;
        float ps(time, y, x) ;
                ps:long_name = "Surface pressure" ;
                ps:standard_name = "surface_air_pressure" ;
                ps:units = "hPa" ;
                ps:coordinates = "xlon xlat" ;
                ps:cell_methods = "time: point" ;
        float u(time, plev, y, x) ;
                u:long_name = "U component (westerly) of wind" ;
                u:standard_name = "eastward_wind" ;
                u:units = "m s-1" ;
                u:coordinates = "xlon xlat" ;
                u:cell_methods = "time: point" ;
        float v(time, plev, y, x) ;
                v:long_name = "V component (southerly) of wind" ;
                v:standard_name = "northward_wind" ;
                v:units = "m s-1" ;
                v:coordinates = "xlon xlat" ;
                v:cell_methods = "time: point" ;
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