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ofstream MyExcelFile ("ADA_result.xlsx", ios::trunc);

is outside the function, which is bothering me. I'm wondering if there might be a problem with opening the file outside the function.

Wouldn't it work if I commented the code for MyExcelFile?

If commenting it works, then

ofstream MyExcelFile ("ADA_result.xlsx", ios::trunc);

to ofstream MyExcelFile;.

Then, at the beginning of initialize, call

MyExcelFile.open("ADA_result.xlsx", ios::trunc);

at the beginning of initialize to open the file, and it will work while writing to MyExcelFile.