I agree with the posts above that you really need to get some CYA into the water. But this is not an instant fix. CYA takes several days to disolve. You will need to test again so get some more reagent.

But go carefully. Lots of people seem to misinterpret the CYA test results. Then you can be in a bigger mess because the only way to lower CYA is to drain and refill. If you think you might be misinterpretting the test then maybe add a quarter of the CYA dose, wait a few days and test again and should see some reading. You don't need to test every day. This stuff goes in slowly and sticks around forever, so save your reagent and wait a few days before you test again.

Before this, what have you been using to chlorinate the pool ?