12 and 56 are not block numbers, they are values in some fields.
To find those fields, download the mq5 file and try to compile in your MetaEditor. The error message will show the problematic code lines, and then you can find the corresponding fxdreema block.
@M-Vaez hi dear maryam, thanks for your reply.
however, I don't have problem in finding the wanted shadows, I had some complication in trading in a different timeframe.
Yes, you can still use any line, not only a trend line, but the problem will still be the same because it will still be a market execution. There is no guarantee the open price will be exactly the one you want.