Package unknown

[Firmly]

Hello guys, im using 21.02.0-rc4 openwrt (in virtualbox) and when I try to install my own package I get error:

root@OpenWrt:/tmp# opkg install /tmp/buffalo_1.0.0-1_arm_cortex-a7_neon-vfpv4.ipk
Unknown package 'buffalo'.

Maybe someone knows why?? I have that ipk file in /tmp folder for sure.

Plus, i tried to compile program on my pc and upload it to router and when I try to execute it:

root@OpenWrt:/usr/bin# ./main
-ash: ./main: not found

Why is this happening?

(i have program in /usr/bin)

[frollic]

Dunno about the package, but did you chmod the binary?

[vgaetera]

Packages must match the system platform:

ubus call system board

[vgaetera]

I'm afraid that VirtualBox doesn't support cross-hardware platform virtualization.
So, download/rebuild your package for x86-64 if you want to test it under VirtualBox.