CHIRP

By my calculation that frequency requires a 1.25kHz step and your radio does not support that step, which is why you get the error. Internally that radio can only store six digits, which means 159.018 is the closest it can even represent in memory.

But it takes 163.1625, 151.587500 etc. model: Yaesu ft-2890R

EDIT: FT-2980R

Right, Yaesus of this vintage can (annoyingly) assume one extra digit based on the last one in order to support 12.5kHz, but no further. Basically if the last digit is a 2 (as in the case of 163.162) or a 7 (as in the case of 151.587), it assumes that it's actually -25 or -75. CHIRP can't make the radio do something it doesn't support - there's literally nowhere to store the extra digit in the radio. Better radios store the frequency as a multiple of a tuning step, which means they can directly resolve much lower but these Yaesus are pretty limited.