The trick is to use 2 newlines as a separator. Assuming Error lines start with "E", this one liner would do the trick: 
perl -nE 'BEGIN{$/="\n\n"}; next unless m/^E/; print "$_"' your-file-h
+ere.txt

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In reply to Re: Using Expressions by NetWallah
in thread Using Expressions by programmercarlito

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