This message is displayed because the two passwords that you typed were not the same.
When you choose to mask password entry by checking the Mask password checkbox, you can't see what you're typing. In order to avoid saving your Zip file with an incorrectly typed password, WinZip® asks you to type the password again. You will see this message when the two passwords you typed were different.
Please re-type the confirmation password and click OK. If it is still incorrect, you probably mis-typed the original password. Click Cancel and try again.