While running the app on simulator or real iOS device, it gives below error.
Any help would be appreciated.
Git hub link - https://github.com/AjiteshMDK/GeoLocation-Update/issues/1
What that's telling you is that you have code, whether your own or a plugin, that has not been updated for NativeScript 7/8. See this link.
If the code is within a plugin, then may have to see if a revised version exists, or contact the plugin owner. I've had two cases recently where I had to migrate a plugin myself.