Unknown error code during application install “-24” installing Instapaper I'm getting the following error when I attempt to install Instapaper through the Play store

Unknown error code during application install “-24”


Googling suggests I need to delete any remnants in the /data/data instapaper folder.  Unfortunately, that seems impossible, I've tried both using file explorers on the device, and adb shell, which tells me "Permission denied" when I try and ls the /data/data folder's contents.

I really don't want to perform a factory reset reinstall everything that is on my device (Nexus 7 2013).

My device is not rooted.

How can I fix things so I can install this app?

I have a logcat file I can attach if it would be helpful.
You would need root to access /data/data, and rooting would require unlocking your bootloader, which would wipe your data.

Other than doing a Factory Reset, there may be no other way.