There is something with the name of mymql_v201.mqh file ... (because of "_" symbol ...) so I changed the name to MyMQLv21.mqh and changed this name inside this indicator too (two files are attached). And it works for now.
EURUSD and USDCHF on the same chart with positive correlation :
EURUSD and GBPUSD on the same chart with positive correlation :
and this is very interesting to me - EURUSD and USDCHF negative correlation :
MetaTrader Trading Platform Screenshots
MetaQuotes Software Corp., MetaTrader 5, Demo
eurusd usdchf negative correlation
get that warning
possible use of uninitialized variable 'myPoints' MyMQLv21.mqh 146 47
get that warning
possible use of uninitialized variable 'myPoints' MyMQLv21.mqh 146 47
Indi is not usable due to lots of fake gaps (when gaps are actually missing on real chart).
Any advice please?

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TandemInstrument:
The indicator displays the charts of two symbols in one window.
Author: Evgeniy Trofimov