If your 1099-B doesn't include the "cost basis" on the form, you will need to enter the cost basis in order to correctly calculate the gain or loss on the sale.
For "noncovered securities" the cost basis is not reported by the broker, and you are responsible for entering that number. When it is correctly entered, you should have a loss on the sale (assuming the proceeds were less than your "cost basis").
Sometimes the cost basis will be reported by your broker in the supplemental schedules attached to the 1099-B . If not, you will need to review the information provided by your company to figure out your "cost basis" in the RSU shares you sold.
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