all new indicators i add does not show, its all black like its invisable.
See pic:
Because they both RETURN nothing (take a look at the last line of their code), since they are made to only plot/draw objects on the price chart, not below.
You need to click on the sparrow on the upper left corner of the price chart, then select ADD INDICATOR and choose the one you want, then repeat the operation for the next indicator.
I apologize for using the wrong word SPARROW.
The correct word is SPANNER.