我想请问下，ERROR: LoadError: type Nothing has no field captures 是什么错

综合讨论区
1

我想请问下，ERROR: LoadError: type Nothing has no field captures 是什么错

# using OceanTools, CoherentStructures, Dates, StaticArrays
start_date = DateTime("2020-01-01T00:00:00")
end_date = DateTime("2020-01-01T23:59:00")
LL_space = [-50.0, -50.0]
UR_space = [50.0, 50.0]
schema = r"^dt_global_allsat_phy_l4_20020101_20180115.*.nc$"
ww_ocean_data = "/foo/ww_ocean_data/"

p, ust1, (Lon, Lat, times)  = read_ocean_velocities(ww_ocean_data,start_date, end_date; schema=schema, LL_space=LL_space, UR_space=UR_space)

using Plots
xs = range(-20, stop=15, length=400)
ys = range(-10, stop=5, length=400)
t = times[10]

vortices, singularities, bg = materialbarriers(
       uv_tricubic, range(-5,7.5,length=300), range(-40,stop=-28,length=300), range(times[2],stop=times[2]+30,length=30),
       LCSParameters(boxradius=4, indexradius=0.25, pmax=1.4,
                     merge_heuristics=[combine_20_aggressive]),
       p=p, on_torus=false);

fig = plot_vortices(vortices, singularities, (-5, -40), (7.5, -28);
    bg=bg, title="DBS field and transport barriers", showlabel=false)

这是我的代码