Code was trapped at display(plt) step

Hi I am trying to use Plots.jl with default backends GR to plot figures. But the code was trapped in the display(plt) process. Any ideas about what happened? Thank you

Here is my code:

plt=scatter3d(tar_xs,tar_ys,tar_zs, marker_z=tar_zs, markercolor = :vikO, markerstrokewidth=0, markersize=5, markershape=:rect, right_margin = 10Plots.mm)
display(plt)
println(“Hello”)

With the following input data, your code works just fine:

using Plots; gr()
tar_xs = tar_ys = tar_zs = 1:20
plt=scatter3d(tar_xs,tar_ys,tar_zs, marker_z=tar_zs, markercolor=:vikO, markerstrokewidth=0, ms=5, markershape=:rect, right_margin=10Plots.mm)
display(plt)
println("Hello")

NB:
Provide a MWE and use triple backticks around your code:
```
type the code here
```

How big are your tar arrays?