Decode Json Data

i have created workflow to generate JSON data using read rest represenation but when i try to create table of the JSON data it shows error no JSON columns are available.can any help? The worflow regarding same is attached 

Why don't you use the new REST nodes instead of the old and unmaintained KREST extension? The new nodes will convert into JSON automatically.

where can i get the new rest nodes?

when i try to update the knime version for new rest nodes. it gives the error

This looks like an internet connection issue. Restart and try again.