I can't tell you what the errors mean since you haven't shown us what they are nor any of the code that causes them. But I have a pretty good guess about how you can get those printed lines to appear when you want them. First add the line

$| = 1;
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at the beginning of your program, then change your print statement to something like

print "Doing table $_\n";
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This will make sure that your print output is not buffered, which is probably the problem you're having now.