java.lang.NullPointerException

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1

When I use the following code

for (int second = 0;; second++) {

if (second >= 60) fail(“timeout”);

try { if (selenium.getAttribute(“id=code@value”).length() == 4) break; } catch (Exception e) {}

Thread.sleep(2000);

}

Return error “java.lang.NullPointerException”

What is the problem?