daśa alaṅkāre - with ten instances of literary ornamentation; yadi - if; eka - one; śloka - verse; haya - there is; eka doṣe - by one fault; saba - all; alaṅkāra - ornaments; haya kṣaya - become null and void.

“If there are ten literary ornaments in a verse but even one faulty expression, the entire verse is nullified.