Problems with Clearblue OPK?

Hey y’all! Has anyone else has a problem with the clear blue advanced ovulation tests (the one that tests estrogen and LH surge)? It sometimes will work for me and sometimes won’t!!! This morning I tried 2 different test sticks and followed the instructions perfectly. It just had the solid test reader symbol (never flashed). Then finally it gave an error message. So i tried again with another test stick, and same thing happened!!! It’s frustrating because these are $50 and I feel like I’m wasting them when they do not work. Last cycle it worked fine for the most part. This cycle I’ve had a lot of problems! I took Clomid CD 3-7 so my OB recommended clear blue ovulation tests. I also have cheap ones on amazon. The picture below is the error message I keep getting! I have got this message 3 times today now: first 2 with FMU, the last just now! Thanks in advance for any input! ❤️