One of two issues causes this error.
No frequencies have been programmed into the scanner
or
One of the banks are not turned on.
To correct #1 press PGM and enter a frequency.
To correct #2 look at the top of the display and you will see BANK and numbers 1-10. They all should be underlined. If one of them is not, let’s say Bank 1, then simply press 1 to turn on that bank. The error should clear right away.