Please provide the full code. The snippet you supplied is insufficient to understand the issue.
Also, please edit your post (don't create a new one) and post your code properly ...
Hoummad Elkraima: Error :
'SetChartWindow' - function not defined VWAP1.mq4 66 7
'Plot' - function not defined VWAP1.mq4 68 10
So where do you define those two functions?
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Error :
'SetChartWindow' - function not defined VWAP1.mq4 66 7