Problem to use Visualization_tools

Dear users

I ran the model and I try to see the outputs. I use croco tools to deal with this. In my history file, there are some variables u,v,ubar,vbar,u east and north.

Here I have two questions:

1)How can I plot current using u,v?
2)I have faced the error when trying to plot time series:
the vector must be the same !

Please help me with your comments.