Hello steve1040,

My text editor (Nodepad++) tells me that the unmatched left curly bracket is the one at the end of this line:

while (my $currentlist_row = $currentlist_csv->getline_hr($currentlist
+_fh)) {
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However, the question remains as to where the missing right bracket should be inserted. From the indentation, the foreach loop identified by james28909 looks suspiciously unclosed, but the following construct lower down:

        }
    }
    }
    # MasterID.currentlist has not been found in pre_historical
    if (not $found) {
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looks suspicious too. So this problem can’t be solved mechanically; you will need to go through the logic of the script (a task which you, as the code’s author/maintainer, are in a better position to undertake than anyone else) and identify the correct relations of the various structural blocks to each other. As always, consistent indentation is the key.

Hope that helps,