Description:
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I suggest a more comprehensible error message (see suggestion in "Expected result"). The current error message was missunderstood by me as "The number of arguments of the function is zero (and must be greater than zero)". Instead it was the number of the position specifier argument that was missing (type, "$" and "1" where reversed).

Test script:
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sprintf("%$1s, %2$s %1$s", "Sir", "Yes");

Expected result:
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Missing position specifier number in /home/ber/Code/Kompetenztest/org/ValiditätEingabe/class_test.php on line $line

Actual result:
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Argument number must be greater than zero in /home/ber/Code/Kompetenztest/org/ValiditätEingabe/class_test.php on line $line