Just solved the issue,
looks like there are some files are missing,
in Voxl2 under the directory (/usr/share/modalai/chi-cdk/ov7251)
all you need is to add these two files to that directory:
1- com.qti.sensormodule.ov7251_combo_0.bin
2- com.qti.sensormodule.ov7251_combo_1.bin
you have two choices,
either you can create these two files under that directory.
or you can just copy them from the following directory [/usr/share/modalai/chi-cdk/ov7251-combo] and past them to [/usr/share/modalai/chi-cdk/ov7251] directory