e5 error on true result glucose meter?

I was wondering if anyone happens to know what 'e5' error means? I have a true result meter...

It means either too small a sample, or the strip was already used.
Basically it means try again.

I have tested with the last 2 strips in the first container. Blood east watery on the first one. The second was coagulation fast. Both resulted E-5. So I opened a new strip container. That strip also resulted E-5. Blood was not as watery and dark red.
I have not changed how I have been testing. I have not eaten yet. Should I keep testing? What should I do?