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It seems a confirmedbug with build 5488
2026.01.03 11:03:52.067 Custom Indicator loading of PriceLine_1.02 (bs_BTCUSDT,M1) from C:\Users\xxxx\AppData\Roaming\MetaQuotes\Terminal\<mt5 id>\my_indicator.ex5 failed [539]
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Error 539 , still persisting after all fixes including portable mode and compatability mode fixes
Alain Verleyen, 2026.01.08 13:33
Error 539 fixed in build 5495.