Robot MT5 programming help / Ajuda na programação do Robot MT5

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Hello .. I am trying to run a robot and it is giving some errors, and I would like you to help me make it run or give me the meaning. some of the mistakes are these

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Errors: <Deleted> Source of Error
arraysize' - undeclared identifie  MqlBookInfo curr_info;for (int idx=0;(idx< arraysize (last_bookarray));idx++) Opinion:
last_bookarray' - undeclared identifier for(int idx=0;(idx<arraysize( last_bookarray ));idx++) Opinion:
last_bookarray' - some operator expected  for(int idx=0;(idx<arraysize( last_bookarray ));idx++) Opinion:
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